y=2x+3 y=3x+1
how do you substitute x and y?
You have two equations equal to y. Set them
equal to each other and solve for x.
y = 2x + 3
y = 3x + 1
3x + 1 = 2x + 3
3x - 2x = 3 - 1
x = 2
Now, you can use either of the original
equations to solve for y.
y = 3x + 1
y = 3(2) + 1
y = 6 + 1
y = 7
Might as well use the other equation
to check your work.
y = 2x + 3
y = 2(2) + 3
y = 4 + 3
y = 7
Answer: x = 2, y = 7