Part a: explain why the x-coordinates of the points where the graphs of the equations y = 2−x and y = 8x+4 intersect are the solutions of the equation 2−x = 8x+4. (4 points) part b: make tables to find the solution to 2−x = 8x+4. take the integer values of x between −3 and 3. (4 points) part c: how can you solve the equation 2−x = 8x+4 graphically? (2 points)

Part A:

The values of x and y are the same at the intersection. This means we can equate the y values to get the equations form for just x.

Part B:

x          2^-x        8^x+4

-3          8                 8

-2          4                64

-1          2               512

0           1               4096

1           2               32,768

2           .25            262,144

3           .125          2097,152            

-3 is the answer.

Part C:

You will plot the two functions on the correct coordinates, and then identify the point of intersection.

On the graph they should intersect at (-3,8)