If y varies directly as x, and y = 36 as x = 9, find y for the x-value 5

Y varies directly as x means this equation : y=kx

given y=36 and x=9, plug it into the equation to find k

36 = 9k, so k=?

k=4

so now you have your equation y=4x

and you're trying to find y given x=5

so

y = 4 (5) so y=?