Posted by Melanie on Tuesday, February 15, 2011 at 6:08pm.
I need help with two problems. Just want to make sure that the answers I put are correct.
1) Which of the following is an equation of a vertical line?
F. 4x + 5y = 0
G. 4 = 16x
H. 3y = 9
I. 4x + 5y = 1
2) Which equation is the equation of a line that passes through (10, 3) and is perpendicular to y = 5x  7?
A. y = 5x + 53
B. y =  1/5x  7
C. y =  1/5x + 1
D. y = 1/5x + 5
It would also be greatly appreciated if you told me how you got your answer. Thanks! :)

Math  MathMate, Tuesday, February 15, 2011 at 6:25pm
Hints:
1. The equation of a vertical line has the yterm absent, since it is not possible to calculate y for a given x.
2. The slope of L: y=5x7 has a slope of 5.
The slope of a line perpendicular to L has a slope m such that 5*m=1, or m=1/5.
Also, if the line L1 passes through the point P(10,3), then by substituting x=10 and solving for y, we should get y=3.
Post your answers for confirmation if you wish.

Math  Melanie, Tuesday, February 15, 2011 at 6:51pm
For 1, I got G and for the second one I got B. are they correct?

Math  MathMate, Tuesday, February 15, 2011 at 6:57pm
G is correct for 1.
For 2,
if I substitute 10 in y =  1/5x  7 ,
I get y=(1/5)*(10)7=27=5, we're looking for 3.
Give it another try. You're close.

Math  Melanie, Tuesday, February 15, 2011 at 7:02pm
Ummm is it C?

Math  MathMate, Tuesday, February 15, 2011 at 7:22pm
You do not seem very sure about it. Can you demonstrate why it is, or it is not C?

Math  Melanie, Sunday, February 20, 2011 at 8:06pm
I'm sure about it now :) Thank you for your help. I know it is C because once I put in the x and y axis into the equation, I multiplied 1/5 with 10 then added one and the result was three that's how I knew it was C :)
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