Question

3x+2y=7
x+y=3
solve

Answer 1

To solve this, you should solve for an x or a y.
For example,

3x + 2y = 7
x = 3-y

3(3-y) + 2y = 7
9 - 3y + 2y = 7
-y = -2
y = 2

Now you can plug this into the originally equation, giving you

x + y = 3
x + 2 = 3
x = 1

There you go!