Question

Use addition or substitution to find the value of x for this set of equations.

Answer 1

can u post the question on here

Answer 2

Use addition or substitution to find the value of x for this set of equations.

x - y = 120
x + y = 150

Answer 3

so use subtraciton
x - y = 120
-
x + y = 150

Answer 4

let's try to use elimination by addition
that is when you look at how it lines up and you add down
so like -y + y = 0 which "cancels out"
and x + x = 2x
and 120 + 150 = 270
so you are left with 2x = 270

do you follow so far?

Answer 5

yess

Answer 6

then can you solve for x from what I gave? :)

Answer 7

would it be x=135

Answer 8

correct :)
then you can plug that into one of the original equations
and solve for y