Solve each system of equations by the substitution method. Show your work.

1. y = 8
   7x = 1 - y
   
   
2. y = x - 1
   4x - y = 19

The "substitution method" is exactly what the words say. For problem 1 take the value given for y, y = 8 and "substitute" it into the second expression. Thus the second expression becomes

Again for the second example. You are given y = x - 1 so replace (substitute) the "y" in the second expression by x - 1. Thus

Cheers,
Penny