## Finding and equation for a horizontal/vertical graph

Simplificatation, evaluation, linear equations, linear graphs, linear inequalities, basic word problems, etc.
MathDumbo
Posts: 4
Joined: Sun Sep 20, 2009 3:09 pm
Contact:

### Finding and equation for a horizontal/vertical graph

Hi guys,I need help on find an equation for these problems,here's how it looks like:

Write an equation for each line.Then graph the line.

38. through (-2,1) and parallel to y=-3x+1
39. through (-3,-1) and perpendicular to y=-2/5x-4
40. through (-7,10) and horizontal
41. through (1,-2/7)and vertical

Now the first two,I know how to do,but the second two are the ones I don't know how to do.Please help me.

stapel_eliz
Posts: 1628
Joined: Mon Dec 08, 2008 4:22 pm
Contact:
To learn the trick, try the two examples in the bottom half of this page.

Hint: One of the lines is of the form "y = (a number)" and the other is of the form "x = (a number)".

nona.m.nona
Posts: 288
Joined: Sun Dec 14, 2008 11:07 pm
Contact:

### Re: Finding and equation for a horizontal/vertical graph

It helps to remember that vertical lines have no slope, so there won't be a "y" in the equation.