Question

if using substitution method how do i solve -4x+y=6, -5x+y=21

Answer 1

First you need to pick a equation and isolate a variable within the equation on one side

Answer 2

how do i do that

Answer 3

so with -4x=y=6 you would solve for x (you could pick y but for this example I will choose he harder of the two).

Answer 4

there should be a - instead of a = between the -4x and the y in my above response sorry

Answer 5

so it would be y=6+4x

Answer 6

Yes that works perfecly as well! good job!

Now plug that whole equation into where you see y in the other equation

Answer 7

-5x-(6+4x)=21

Answer 8

yes good job, I'm sorry but I have to go :( your on the right track though

Answer 9

thanx for help