Question 264736
Here is another problem that I am confused with.  Some of the problems are one way and then they are changed around and that when I get lost.

y = 2x + 1
x + y = 4

whenever you get such a problem first you get all the variables on the left side of the equation and the numbers on the right side.

y-2x=1
y+x=4

subtract

-3x=-3

3x=3
x=1

y+1=4
y=4-1 =3