One of the valves on the hoover dam releases 40000 gallons of water per second. what is the rate in gallons per minute

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

The input to the function is x and the output is y. write the function such that x can be a vector (use element-by-element operations). a) use the function to calculate y(-1.5) and y(5). b) use the function to make a plot of the function y(x) for -2 ≤ x ≤ 6.

Which ordered pair is a solution of the equation? 2x+3y=10