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Adding and subtracting with negatives activity
If y varies inversely with x and y = 12 when x = 6, find the value of y when x = 9.
How to solve:
Inverse Variation Formula:
y = k / x
Substitute 6 for x and 12 for y:
12 = k / 6
Solve for k:(Multiply both sides by 6)
72 = k
New equation:(Substitute 72 for k)
y = 72 / x
Substitute 9 for x:
y = 72 / 9
y = 8
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