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6 June, 15:48

the variable z is directly proportional to x. when x is 15, z has the value of 120. what is the value of z when x=25

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  1. 6 June, 19:42
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    The governing equation here is y = kx.

    When x is 15, z = 120. Find k:

    120 = k (15) leads to k = 120/15, or 8. Then y = 8x.

    Now, what iz z when x = 25? Substitute 25 for x in y = 8x: y = 200 (answer)
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