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

Question 1:

A is (0,2) and
B is (2,32)
y = 2 × 4 x

Question 2:

A is (0,3) and
B is (1,15)
y = 3 × 5 x

Question 3:

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

Question 4:

A is (2,-45) and
B is (3,-135)
y = -5 × 3 x

Question 5:

A is (2,-45) and
B is (5,-1215)
y = -5 × 3 x

Question 6:

A is (2,-36) and
B is (4,-324)
y = -4 × 3 x