Question

The graph of y = -3x + 2 intersects the graph of an exponential function at (-1, 5). Which of the following could be the exponential function?

Answer 1

I'm Stuck...

Answer 2

What are the options given

Answer 3

Umm

Answer 4

y = 10(2)^2
y = 10(0.5)^2
y = 5^x
y = 5(2)^x

Answer 5

Those are the answer Choices.

Answer 6

But I need to know how to do it...

Answer 7

\[y=10(2)^2 , y=10(0.5)^2, y=5^x, y=5(2)^x\]
Just to make it easier to see.

Answer 8

If it intersects at (-1, 5), that means that point is on both lines

Answer 9

o

Answer 10

So you can graph y = -3x + 2 and the options and see which one goes on (-1, 5) with y = -3x + 2
Or you can substitute -1 for x and 5 for y in the options and if both sides are equal it means the point is a solution of the exponential function, making it your answer

Answer 11

Okay. Thanks!