Can someone tell me if my answer is right and if not what the answer is?

You're really close. lol.

the slope of the line isn't negative though.

when the line is moving up to the right, it's positive.

the y-intercept is also positive. the y-intercept is where the line intercepts with the y-axis. if you look at the graph, you'll see that the line intercepts with the y-axis at +8 instead of -8

The answer is:

C. y = 1/4x + 8

No that's wrong it is the third one.

Step-by-step explanation:

The line is on a positive slope so it has to be a positive x-value. Also, the y intersect is at positive 8.

square pyramid

step-by-step explanation:

square prism looks like nothing like that

triangular prism has a rectangular base instead of a square base

tetrahedron has a triangular base