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