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

Question 1:

A is (0,-5) and
B is (2,-45)
y = -5 × 3 x

Question 2:

A is (0,-3) and
B is (2,-75)
y = -3 × 5 x

Question 3:

A is (0,2) and
B is (1,10)
y = 2 × 5 x

Question 4:

A is (3,108) and
B is (5,972)
y = 4 × 3 x

Question 5:

A is (4,-405) and
B is (5,-1215)
y = -5 × 3 x

Question 6:

A is (2,-8) and
B is (3,-16)
y = -2 × 2 x