Question

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

2x + y = 8
-x - 3y = -12

3y + 12

-3y + 12

3y - 12

-3y - 12

Answer 1

@jim_thompson5910 he should help u :)

Answer 2

Solve for x in -x - 3y = -12 to get

-x - 3y = -12

-x - 3y+3y = -12+3y ... Add 3y to both sides.

-x + 0y = -12 + 3y

-x + 0 = -12 + 3y

-x = -12 + 3y

-x = 3y -12

x = -3y + 12 ... change the sign of every term to go from -x to x

Answer 3

Thank You and sorry i wasnt on wifi crashed

Answer 4

that's ok and yw

Answer 5

thx for helping her @jim_thompson5910

Answer 6

wait which one is it? those last two just confused me @jim_thompson5910

Answer 7

brb gonna go eat btw

Answer 8

the answer is there

Answer 9

it's the last line

Answer 10

oh ok thank you!

Answer 11

you're welcome