1. Find the slope of the line that passes through (-2,1), (1,10).
a. 3
b. -3
c. 1/3
d. -1/3
2. Which equation represents a direct variation? What is the constant variation?
a.3y = 2x + 1; 1
b.y = -5x - 11; 5
c.4y = -12x; -3
d.y + 7 = 2x - 1; 7
3. Suppose y varies directly with x, and y = 12 when x = -3. What is the value of y when x = 6.
a. -24
b. 2
c. -2
d. -4
4. What is the equation of a line with a slope of -7 and a y-intercept of 6?
a.6y = -7x
b.y = 6x + (-7)
c.-7y = x + 6
d.y = -7x + 6
5. What is the equation of the line through (5,1) with a slope of -3?
a.y + 1 = 3(x + 5)
b.y - 1 = 3(x - 5)
c.y - 1 = -3(x - 5)
d.y + 1 = -3(x - 5)
6 answers
I don't understand any of these.
1. Find the slope of the line. (1 point)
2
–2
½
-½
2. Find the slope of the line that passes through (‒2, 1), (1, 10). (1 point)
3
–3
⅓
-⅓
3. Which equation represents a direct variation? What is the constant of variation? (1 point)
3y = 2x + 1; 1
y = ‒5x ‒ 11; 5
4y = ‒12x; ‒3
y + 7 = 2x ‒ 1; 7
4. Suppose y varies directly with x, and y = 12 when x = ‒3. What is the value of y when x = 6? (1 point)
–24
2
–2
–4
5. What is the equation of a line with a slope of ‒7 and a y-intercept of 6? (1 point)
6y = ‒7x
y = 6x + (‒7)
‒7y = x + 6
y = ‒7x + 6
6. What is the equation of the line that passes through the points (0, 4) and (3, ‒2)? (1 point)
y = 2x + 0
y = ‒ 1/2x + (‒2)
y = ‒2x + 4
y = 1/2x+ 4
7. What is the equation of the line through (5, 1) with a slope of ‒3? (1 point)
y + 1 = 3(x + 5)
y ‒ 1 = 3(x ‒ 5)
y ‒ 1 = –3(x ‒ 5)
y + 1 = ‒3(x ‒ 5)
8. What is the equation of the given line in point-slope form? (1 point)
y ‒ 1 = 2(x + 2)
y ‒ 1 = 2(x ‒ 2)
y – 2 = 2(x + 1)
y ‒ 2 = (x + 2)
2
–2
½
-½
2. Find the slope of the line that passes through (‒2, 1), (1, 10). (1 point)
3
–3
⅓
-⅓
3. Which equation represents a direct variation? What is the constant of variation? (1 point)
3y = 2x + 1; 1
y = ‒5x ‒ 11; 5
4y = ‒12x; ‒3
y + 7 = 2x ‒ 1; 7
4. Suppose y varies directly with x, and y = 12 when x = ‒3. What is the value of y when x = 6? (1 point)
–24
2
–2
–4
5. What is the equation of a line with a slope of ‒7 and a y-intercept of 6? (1 point)
6y = ‒7x
y = 6x + (‒7)
‒7y = x + 6
y = ‒7x + 6
6. What is the equation of the line that passes through the points (0, 4) and (3, ‒2)? (1 point)
y = 2x + 0
y = ‒ 1/2x + (‒2)
y = ‒2x + 4
y = 1/2x+ 4
7. What is the equation of the line through (5, 1) with a slope of ‒3? (1 point)
y + 1 = 3(x + 5)
y ‒ 1 = 3(x ‒ 5)
y ‒ 1 = –3(x ‒ 5)
y + 1 = ‒3(x ‒ 5)
8. What is the equation of the given line in point-slope form? (1 point)
y ‒ 1 = 2(x + 2)
y ‒ 1 = 2(x ‒ 2)
y – 2 = 2(x + 1)
y ‒ 2 = (x + 2)
So what’s the answer?
anyone got the answers yet
Answers for mid-unit review practice are
1. B
2. A
3. C
4. A
5. D
6. C
7. C
8. A
1. B
2. A
3. C
4. A
5. D
6. C
7. C
8. A
>.< is completely correct!
2 answers