Will give brainiest and points if you can copy and type up a few

Sundar used linear combination to solve the system of equations shown. he did so by multiplying the first equation by 5 and the second equation by another number to eliminate the y-terms. what number did sundar multiply the second equation by? 2x+9y=41 3x+5y=36

The function models the number of accidents per 50 million miles driven as a function

Can someone tell me if this is perpendicular? !