consider the equation 7x + 4 = ax + b.

for each pair of values for a and b, determine the number of solutions that the equation has.

select no solution, one solution, or infinitely many solutions for each pair of values.

1. a = 7, b = -4

2. a = 4, b = 7

3. a = 7, b = 4

4. a = -7, b = 4