Exponential Functions: Find the equation through the points A and B in the form y = a b x

Question 1:

A is (0,-3) and
B is (2,-48)
y = -3 × 4 x

Question 2:

A is (0,5) and
B is (1,20)
y = 5 × 4 x

Question 3:

A is (0,-4) and
B is (1,-8)
y = -4 × 2 x

Question 4:

A is (2,27) and
B is (5,729)
y = 3 × 3 x

Question 5:

A is (2,-8) and
B is (5,-64)
y = -2 × 2 x

Question 6:

A is (3,-32) and
B is (5,-128)
y = -4 × 2 x