f(x)= 3x + 4
a=4
a=3
a=x
b=4
b=3
b=x
f(x)= 2x - 6
a = 2
a = 6
a = -2
a = -6
b = 2
b = 6
b = -2
b = -6
f(x)= x+5
a = 0
a = x
a = 1
b = 0
b = 5
f(x)= x
b = 1
b = x
f(x)= -x
a = -x
a = -1
b = -1
b = -x
f(x)= 6
a=6
a=1
a=0
b=0
b=1
b=6
