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y = 4x − 72 (x=8) 2) y = 5x − 42 (x=-13) 3) y − 3x = 15 (x=3)

Mathematics

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Here are the solutions for the first two problems from the image.

:
Given the equation y=4x−72y = 4x - 72 and x=8x = 8.

  1. Substitute the value of xx into the equation.

    y=4(8)−72y = 4(8) - 72

  2. Perform the multiplication.

    y=32−72y = 32 - 72

  3. Perform the subtraction.

    y=−40y = -40

    The value of yy for is:

    −40\boxed{-40}

    :
    Given the equation y=5x−42y = 5x - 42 and x=−13x = -13.

  4. Substitute the value of xx into the equation.

    y=5(−13)−42y = 5(-13) - 42

  5. Perform the multiplication.

    y=−65−42y = -65 - 42

  6. Perform the subtraction.

    y=−107y = -107

    The value of yy for is:

    −107\boxed{-107}
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