What is the equation in slope intercept form

The variable z is directly proportional to x, and inversely proportional to y. when x is 4 and y is 13, z has the value 1.2307692307692. what is the value of z when x= 9, and y= 20

On average, how many more hits will he get when he bats 100 times at home during the day as opposed to 100 times away at night?

Divide. reduce the answer to lowest terms.5 2/3 ÷ 3 1/9