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 = -6
3x + y = 8

-2y + 6
2y - 6
2y + 6
-2y - 6

@itsbribro @amistre64

Answer 1

@campbell_st

Answer 2

so -x + 2y = -6

can you make x the subject of this equation...?

Answer 3

yes by making y 0 and then making -x=-6

Answer 4

no, you need to retain the terms containing y....

so subtract 2y from both sides of the equation... what do you get..?

Answer 5

-6-2y=-x

Answer 6

great not multiply every term by -1 to get a positive x value

what do you get..?

Answer 7

wait like -6(1)-2(1)=-x?

Answer 8

no.... mutliplying each term by -1 means to reverse the sign... make them all positive

Answer 9

6+2y=x

Answer 10

so the answer is 2y+6

Answer 11

@chosenmatt