the value of y varies directly with x. If x equals 3 then y equals 21 what is the value of x when y equals 105.
1 answer:
Answer:
x = 15
Step-by-step explanation:
The equation for direct variation is
y = kx
y=21 when x=3
21 = k*3
Divide each side by 3
21/3 = 3k/3
7 =k
y = 7x
Let y=105
105 = 7*x
Divide by 7
105/7 = x
15 =x
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