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If y varies directly as x and y = 15 when x = 5, find the value of y when x = 6.
How to solve:
Direct Variation Formula:
y = kx
Substitute 5 for x and 15 for y:
15 = k(5)
Solve for k:(Divide both sides by 5)
3 = k
New equation:(Substitute 3 for k)
y = 3x
Substitute 6 for x:
y = 3(6)
y = 18
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