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8 July, 00:22

The variables y and x have a proportional relationship, and y = 7 when x = 2.

What is the value of y when x = 5?

The variables y and x have a proportional relationship, and y = 7 when x = 2.

What is the value of x when y = 21?

Which equation represents a proportional relationship?

y=-x

y=-5 (x+1)

y = 5x + 1

y=15x

+5
Answers (2)
  1. 8 July, 00:29
    0
    17.5

    i just did it on my quiz and it was wrong (the other guy is wrong)
  2. 8 July, 00:40
    0
    y = 35/2 when x=5

    x=6 when y = 21

    Proportinal relatiionships: y=-x, y=15x

    Step-by-step explanation:

    The formula for direct variation is

    y = kx

    If y=7 and x=2, we can solve for k

    7 = k*2

    Divide by 2

    7/2 = k

    y = 7/2 x

    Now if x=5

    y = 7/2 * 5

    y = 35/2

    Now if y=21

    21 = 7/2 * x

    Multiply by 2/7

    21 * 2/7 = 7/2 * 2/7 x

    6 = x

    Which equation represents a proportional relationship?

    y=-x

    YES k = - 1 Some people debate about having a negative constant, but everything I have read and taught says you can have a negative constant.

    y=-5 (x+1)

    This does not go through the origin so no

    if x=0 y = - 5

    y = 5x + 1

    if x = 0 y = 1 so no

    y=15x

    YES k = 15
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