What method can be used to write the equation of a line in slope-intercept form given two points?
Find the slope using the formula m = StartFraction y 2 minus y 1 Over x 2 minus x 1 EndFraction, and then substitute one point and the slope into the equation y = m x + b to find the y-intercept.
Find the slope using the formula m = StartFraction x 2 minus x 1 Over y 2 minus y 1 EndFraction, and then substitute one point and the slope into the equation y = m x + b to find the y-intercept.
Find the y-intercept using the formula m = StartFraction y 2 minus y 1 Over x 2 minus x 1 EndFraction, and then substitute one point and the y-intercept into the equation y = m x + b to find the slope.
Find the y-intercept using the formula m = StartFraction x 2 minus x 1 Over y 2 minus y 1 EndFraction, and then substitute one point and the y-intercept into the equation y = m x + b to find the slope.
32 answers
Weeks, x
Dollars in account, y
4
74
6
86
9
104
11
116
Which linear equation represents Catherine’s situation?
y = one-sixth x + 70
y = 6 x + 50
y = StartFraction 1 Over 9 EndFraction x + 104
y = 11 x + 116
m = (y2 - y1) / (x2 - x1)
m = (86 - 74) / (6 - 4)
m = 12 / 2
m = 6
Now we have the slope and can use one of the points to find the y-intercept:
y = mx + b
74 = 6(4) + b
74 = 24 + b
b = 50
Therefore, the linear equation that represents Catherine's situation is:
y = 6x + 50
Calculate StartFraction 8 minus (negative 4) Over negative 1 minus 5 EndFraction = StartFraction 12 Over negative 6 EndFraction = negative 2..
Calculate StartFraction negative 1 minus 5 Over 8 minus (negative 4) EndFraction = StartFraction negative 6 Over 12 EndFraction = negative one-half..
Find that the point at which the line intersects with the line y = 0 is (3, 0).
Find that the point at which the line intersects with the line x = y is (2, 2).
A graph titled Food Pantry Donations has number of days on the x-axis and dollars donated on the y-axis. A line goes through points (1, 75) and (2, 100).
The slope of the line that represents the data that Miguel collected is 25, and the y-intercept is 50. What do the slope and y-intercept represent in Miguel’s situation?
The slope indicates that the food pantry collects $50 each day. The y-intercept indicates that the pantry began with $50 in its donation account.
The slope indicates that the food pantry collects $25 each day. The y-intercept indicates that the pantry began with $25 in its donation account.
The slope indicates that the food pantry collects $25 each day. The y-intercept indicates that the pantry began with $50 in its donation account.
The slope indicates that the food pantry collects $50 each day. The y-intercept indicates that the pantry began with $25 in its donation account.
Step 1: m = StartFraction 13 minus 25 Over negative 4 minus (negative 7) EndFraction = StartFraction negative 12 Over 3 EndFraction = negative 4. Step 2: y = negative 4 x + b. 25 = negative 4 (negative 7) + b. 25 = 28 + b. 25 minus 28 = 28 + b minus 28. b = negative 3. Step 3: y = negative 3 x minus 4
What was Brooke’s error?
She found the incorrect slope in step 1.
She mixed up the x- and y-coordinates when she plugged in the point in step 2.
She found the incorrect y-intercept in step 2.
She mixed up the slope and y-intercept when she wrote the equation in step 3.
The correct calculation in step 2 should be:
25 = -4(-7) + b
25 = 28 + b
b = -3
So the equation should be:
y = -4x - 3
On a coordinate plane, a line goes through points (0, negative 1) and (2, 0).
Which equation proves Jeremy’s argument is incorrect?
y = negative one-half x minus 1
y = negative one-half x + 1
y = one-half x minus 1
y = one-half x + 1
This is because the equation has the same slope as the given line (-1/2) but a different y-intercept (1 instead of -1). Therefore, it represents a different line with the same slope but a different y-intercept.
y 1 minus (StartFraction y 2 minus y 1 Over x 2 minus x 1 EndFraction) (x 1)
y 1 minus (StartFraction y 2 minus y 1 Over x 2 minus x 1 EndFraction) (x 2)
y 1 + (StartFraction y 2 minus y 1 Over x 2 minus x 1 EndFraction) (x 1)
y 1 + (StartFraction y 2 minus y 1 Over x 2 minus x 1 EndFraction) (x 2)
A)y 1 minus (StartFraction y 2 minus y 1 Over x 2 minus x 1 EndFraction) (x 1)
B)y 1 minus (StartFraction y 2 minus y 1 Over x 2 minus x 1 EndFraction) (x 2)
C)y 1 + (StartFraction y 2 minus y 1 Over x 2 minus x 1 EndFraction) (x 1)
D)y 1 + (StartFraction y 2 minus y 1 Over x 2 minus x 1 EndFraction) (x 2)
$92.55
$94.37
$100.52
$114.39
y = -0.91x + 103.47 (where x = 12)
y = -0.91(12) + 103.47
y = -10.92 + 103.47
y = 92.55
Therefore, the price of the stock after it has been owned for 12 weeks is $92.55.
Answer: $92.55
$4.87
$7.74
$9.74
$19.48
y = 2x + 9.74 (where x = 0)
y = 2(0) + 9.74
y = 9.74
Therefore, the value of the coin when Consuello originally purchased it was $9.74.
Answer: $9.74
only Vladimir
only Robyn
both Vladimir and Robyn
neither Vladimir nor Robyn
We can confirm this by using the slope-intercept form:
m = (y2 - y1) / (x2 - x1)
m = (9 - (-3)) / (10 - (-5))
m = 12 / 15
m = 4/5
Now we have the slope m and can use one of the points to find the y-intercept:
y = mx + b
-3 = (4/5)(-5) + b
-3 = -4 + b
b = 1
Therefore, the equation of the line is:
y = (4/5)x + 1
On the other hand, the points (-10, -7) and (-15, -11) have a slope:
m = (-11 - (-7)) / (-15 - (-10))
m = -4 / -5
m = 4/5
However, using the first point:
-7 = (4/5)(-10) + b
-7 = -8 + b
b = 1
Therefore, the equation of the line passing through the points (-10, -7) and (-15, -11) is:
y = (4/5)x + 1
Since Vladimir's equation and Robyn's equation are the same, only Vladimir is correct.
The slope is One-half.
The slope is Negative 2.
The y-intercept is 7.
The y-intercept is 13.
Using the formula for slope:
m = (y2 - y1) / (x2 - x1)
m = (7 - 10) / (12 - 6)
m = -3 / 6
m = -1/2
However, this is not one of the answer choices. The correct slope can be found by simplifying the fraction:
m = -3 / 6
m = -1 / 2
Therefore, the slope is negative 2, and none of the answer choices are correct.
the cost for each hour it takes to repair the machine
the cost for coming to look at the machine
the total cost for fixing the washing machine
the amount of time that it takes to arrive at the home to make the repairs
Mark this and return
x
y
–6
–18
–1
–8
4
2
9
12
y = negative 2 x minus 6
y = negative 2 x + 6
y = 2 x minus 6
y = 2 x + 6
Using the points (-6, -18) and (-1, -8), we can find the slope:
m = (y2 - y1) / (x2 - x1)
m = (-8 - (-18)) / (-1 - (-6))
m = 10 / 5
m = 2
Now we have the slope, and we can use one of the points to find the y-intercept:
y = mx + b
-8 = 2(-1) + b
-8 = -2 + b
b = 6
Therefore, the equation in slope-intercept form is:
y = -2x + 6
Round to the nearest hundredth if necessary.
y = 71 x minus 29.82
y = 25 x minus 66
y = 0.42 x + 71
y = 0.42 x + 55
y - y1 = m(x - x1)
Let (x1, y1) be the point (138, 112.96) for Bob's cost and (209, 142.78) for Carl's cost. We can then find the slope m:
m = (y2 - y1) / (x2 - x1)
m = (142.78 - 112.96) / (209 - 138)
m = 29.82 / 71
m = 0.42
Now we have the slope, and we can use one of the points to find the y-intercept:
y - y1 = m(x - x1)
y - 112.96 = 0.42(x - 138)
y - 112.96 = 0.42x - 57.96
y = 0.42x + 55
Therefore, the equation that represents the cost of the rental truck is:
y = 0.42x + 55
Answer: y = 0.42 x + 55
x
y
1
7
2
5
3
3
4
1
What would she have gotten for the equation of the linear function if she had used the ordered pairs (2, 5) and (4, 1) instead?
y = negative 4 x + 9
y = negative 4 x + 18
y = negative 2 x + 9
y = negative 2 x + 18
m = (y2 - y1) / (x2 - x1)
m = (1 - 5) / (4 - 2)
m = -4/2
m = -2
Now we have the slope, and we can use one of the points to find the y-intercept:
y = mx + b
1 = -2(4) + b
1 = -8 + b
b = 9
Therefore, the equation in slope-intercept form is:
y = -2x + 9
So Misty would have gotten the same equation (y = -2x +
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