x = 21
y = 6
x = 4y - 3
x + y - 7 = 20
Because we have a value for x, we can put it in the second equation to find the value of y.
4y - 3 + y - 7 = 20
Combine like terms.
5y - 10 = 20
Add 10 to both sides.
5y = 30
Divide both sides by 5.
y = 6
Now we can place this value of y back into the equation to find the exact value of x.
x + 6 - 7 = 20
Combine like terms.
x - 1 = 20
Add 1 to both sides.
x = 21
