Question

Find the value of x and y in the following equation.
7+4y=-3x
7x+108=9y

Answer 1

do you know how to start a problem like this? You first just want to get one of the variable alone so you can plug what it equals into the other equation.

Answer 2

Yeah I know that process

Answer 3

ok so what did you get stuck on?

Answer 4

how would you change the problems so that they match each other?

Answer 5

what u want to do is get ur equation to look like this: x =.....
then u just plug what x equals into the other equation.

Answer 6

ok so far I have: -3x+4y=7 and 7x+9y=108. What number would I multiply one of the equations so they cancel?

Answer 7

ok so take 7x + 9y = 108
then subtract 7x
9y = 108 -7x
then divide by 9
y = 7/9x + 12
now you can plug this for y in the other equation.