Answer:
y=3x-2
Step-by-step explanation:
you find the 3 (the slope) by seeing how much the y value grows
the -2 is the value of the y-intercept (more clear on a graph) but it's when the point is (0,__) so you subtract 3 from 1.
Step-by-step explanation:

I think, he made a mistake because the exponents have different values but then if you'll look at his results, he just wrote the same thing. If you want, you could post the original problem, and I'll solve it for you :)
The answer would 9 cm. All of the given choices are wrong
since the measurement maybe too big or too small. Like for 9 millimeter, it
would be too small for a clothespin. While 9km is too big for a clothespin,
there is no such thing as a 9km clothespin. While 9 m is also too big. The
approximate size of a clothespin is 3 inches, when we convert it to cm, it will
be 7 cm. So 9 cm is a best approximate.