Posted by **Liz** on Saturday, April 24, 2010 at 7:14pm.

How do you solve and graph these equations?

y = 4x + 5

x - 2y = 4

- Algebra -
**Damon**, Saturday, April 24, 2010 at 7:46pm
y = 4 x + 5, through (0,5) slope 4

2y = x - 4

y = (1/2) x - 2 , through(0,-2) slope (1/2)

now subtract second from first to get rid of y

0 = 3.5 x +7

x = -2

then y = -8+5 = -3

so they cross at (-2,-3)

check

y = 4x + 5

-3=4(-2)+5??

-3=-8+5 yes

x - 2y = 4

-2 -2(-3) =4 ??

-2 +6 = 4 sure enough

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