1. Write an equation in slope-intercept form for the line that passes through (5,0) and is perpendicular to the line given by y = -5/2x + 6.
A: m = 2/5
y = mx + b
0 = (2/5)(5) + b
0 = 2 + b
b = -2
y = 2x/5 -2?
2. Write an equation in slope-intercept form for the line that passes through (0, 0) and is parallel to the line given by y = -6/7x + 1.
A: ?
Identify which lines are parallel.
3. y = -2x; y = 2x + 1; y = 2x; y = 2(x + 5)
A: All of the above.
4. -3y = x; y = -1/3x + 1; y = -3x; y + 2 = x + 4
A: y = -1/3x + 1; y = -3x?
5. y = -3x + 2; y = 1/2x - 1; -x + 2y = 17; 3x + y = 27
A: y = -3x + 2; 3x + y = 27?
4 answers
Can someone please help me?
#1 ok
you can avoid solving for b by using the point-slope form:
y-0 = 2/5 (x-5)
#2 how could you get #1 and not get #2?
m = -6/7
point-slope form:
y-0 = -6/7 (x-0)
y = -6x/7
all this means is that b=0
#3 1st has slope -2
the others all have slope 2
#4 only the 1st two.
The slopes are -1/3, -1/3 -3,1
#5 almost. the slopes are
-3, 1/2, 1/2, -3
so, your answer is correct, but there are 2 pairs of parallel lines.
you can avoid solving for b by using the point-slope form:
y-0 = 2/5 (x-5)
#2 how could you get #1 and not get #2?
m = -6/7
point-slope form:
y-0 = -6/7 (x-0)
y = -6x/7
all this means is that b=0
#3 1st has slope -2
the others all have slope 2
#4 only the 1st two.
The slopes are -1/3, -1/3 -3,1
#5 almost. the slopes are
-3, 1/2, 1/2, -3
so, your answer is correct, but there are 2 pairs of parallel lines.
To clarify:
3. Incorrect; y = 2x + 1; y = 2x; y = 2(x + 5)
4. Incorrect; -3y = x; y = -1/3x + 1
5. I don't quite understand what you said.
3. Incorrect; y = 2x + 1; y = 2x; y = 2(x + 5)
4. Incorrect; -3y = x; y = -1/3x + 1
5. I don't quite understand what you said.
I'm just saying that the two you picked are parallel, but so are the other two. Don't know how the question is structured, and how you can answer, but unless there's a typo, there are two possible choices.
1 answer