For the following system, use the second equation to make a substitution for y in the first equation. 3x + y = 2 y + 4 = 3x

First, set the second equation with y as the isolated variable. To do this, subtract 4 from both sides to get

Now that you know the value of y, put that expression in for y in the first equation to get

Then, simplify by adding the x terms together to get

add 4 on both sides to isolate the x terms to get


then divide 6 from both sides to get

Using that x value, plug it into one of the equations as x to find y ( I will use y=3x-4)

x=1 and y=-1 is the answer