Question

systems of equations : y=x-3
4x+y=32
how do you solve this?

Answer 1

You know that y=x-3.
You can use this in y our second equation to solve for x
4x+(x-3)=32
5x-3=32
5x=35
x=7
Now you know x, so you can substitute 7 for x in y=x-3.
y=7-3=4
You can check if it's correct by plugging both values back into the other equation:
4(7)+4=32=28+4=32.
The expression is true, so those are the solutions.

Answer 2

wait is y already solved?

Answer 3

No, y is not already solved. I had to solve it after I found x here. We substituted x-3 for y in the other equation so we could solve for x.

Answer 4

\[4x+y=4x+(x-3)=32\]