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11 questions
Y varies directly as x. If y = 12 when x = 15, what is y when x = 20?
4/5
17
16
25
n varies directly with c. If c = 24 when n = 18, what is c when n = 22?
88/3
28
66/4
24
Which equation exhibits a direct proportion?
y = 5x - 2
y = 3/4 x
y - x = 4
x = 6
Which equation is not an example of direct proportion?
y = x
y = 3x
y = - 6x
y = 2/3 x + 5
What is the value of k in the following equation? y = 2/7 x
4
-4
2/7
7
For an equation to be directly proportional, it must .......
pass thru two points
pass thru the origin
be positive
not have a fraction
Upon seeing, "y varies directly as x" we immediately.....
write down what x and y are
write down what k is equal to
substitute into the equation
write y = kx
What means the same thing as direction proportion
x = y
direct variation
y = k + x
scale up proportion
Y varies directly as x. If y = 39 when x = 52, what is the best answer for k?
k = 52
k = 4/3
k = 3/4
k = 39/52
If x = 9 when y = 30, and x = 27 when y = 90, does y vary directly with x? If so, what is k equal to
Yes, k = 10/3
no
Yes, k = 3/1
Yes, k = 9
What is the direct proportion equation for the following information. x = 12, y = 16
16 = k(12)
y = kx
y = 4/3 x
k = 16/12
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