Question

solve using substitution, show work
-7x - 2y = -13
x - 2y = 11

Answer 1

i have.
-7x - 2y = -13
-2y = -13 + 7x
what do i do from here?

Answer 2

how did you get -2y = 11 - x?

Answer 3

ok... so all you have to do is substitute it into the 2nd equation

x + (-13 + 7x) = 11

Answer 4

nothing with -2y ?

Answer 5

I just used the 2nd equation while you used the 1st equation

so if I used -2y = 11 - x

then substituting it into the 1st equation you get

-7x + (11 - x) = -13

Answer 6

i see.

Answer 7

both methods will give the same answer...

Answer 8

so.
x - 2 (-13 + 7x) = 11
x + 26 - 14x = 11
x - 14x + 26 = 11
-13x + 26 = 11
-13x = 37
x= -2.84 ?

Answer 9

remember you are replace -2y

so the equation is

x + -2y = 11

then

x + (-13 + 7x) = 11

so then after distributing you get

x + 7x - 13 = 11

or

8x - 13 = 11

now just solve for x