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March 25, 2017

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Suppose that y is directly proportional to x.
If y = 10 when x = −5, what is the value of y when x = 30?

  • maths - ,

    "y is directly proportional to x" --- y = kx , where k is a constant
    for the given:
    10 = -5k
    k = -2

    so y = -2x is your equation:

    so when x = 20 , y = ......

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