Question

Solve the following system using the substitution method:
-9x+3y=-15
y=3x-5

Answer 1

-9x+3(3x-5)=-15
Is x=-1/3 or -3?

Answer 2

-9x+3(3x-5)=-15
-9x+9x-15=-15
-15=-15
true
x=any real number

Answer 3

Ooooh ok, I see my mistake
So, what's x so I can finish the problem?

Answer 4

x can be any number; given some x, y is 3x-5
(0,-5) works, (1,-2) works, etc

Answer 5

Oh ok, got it! Thanks!

Answer 6

:)