Question

For the following system, if you isolated x in the first equation to use the Substitution Method, what expression would you substitute into the second equation?

-x - 2y = -4
3x + y = 12

-2y - 4

2y - 4

2y + 4

-2y + 4

Answer 1

-2y+4

Answer 2

@speedygonzales can you help me?

Answer 3

-x - 2y = -4
3x + y = 12
x=-2y+4
3(-2y+4)+y = 12
-6y+12+y=12
-5y = 0
y = 0
-x-2(0) = -4
-x = -4
x = 4
(4,0)

Answer 4

ok, thanks