Question

how do you rewrite an equation for using substitution method that already isnt in y= form? Please give example step by step

Answer 1

solve for y

Answer 2

Are you talking about a system of equations?

Answer 3

yes

Answer 4

I believe it is solve each equation for a variable and substitute on in the other.

Answer 5

yes! like how would you solve..

2x – 3y = –2
4x + y = 24
the top equation getting y by itself so I can substitute?

Answer 6

Better to solve the bottom equation for y and substitute it into the top equation. The bottom equation can be solved for y just by moving the 4x to the other side, giving you y=24 -4x. Then just take that and substitute it into the top equation for y.

Answer 7

x + y = 11
3x - y = 5

so here's a sample system of equations. first you have to solve for one variable, like evansda said.

so let's solve for y.

x + y = 11
y = 11 - x

Then we substitute in this y value into the second equation.

3x - (11 - x) = 5

Now solve.

3x - (11 - x) = 5
3x - 11 + x = 5
4x - 11 = 5
4x = 16
x = 4

Now insert this x value into either equation and solve for y.

x + y = 11
4 + y = 11
y = 7

So we get x=4, y = 7 or (4,7)

Answer 8

thank you guys so much