I need to solve for x and y


x+y=4 y+-x=3

you have to determine in one equation what x ( or y ) and then sub it into the other equation.

x + y = 4 turns into x = 4 - y , then you sub that value in for x in the other equation.

y + -(4-y) = 3 which is simplified into y -4 + y = 3 and then simplified more yet again into
2y = 7 or y = 3 1/2

using the value of y = 3 1/2 you can find out that x = 1/2

very exciting imo

personally I think its faster to use elimination method in this question. Although it depends on preference. You can just add the two equations together.

ex.
x+y=4
+ y+-x=3
=
2y = 7
y = 7/2