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Section 5.1.1
Direct and Inverse
Variation
Lesson Objective:
Students will:
• Formally define and apply inverse and direct variation.
1:
6.65 = 1000k
p(120,000) = 0.00665($120,000)
p(120,000) = $798
p(B) = 0.00665B
1:
2:
2:
5-3: Suppose y varies directly with the square of x.
a: Express this relationship generally using k as the constant of variation.
2y kx=
5-3:
b: Solve for the specific solution (find the value of k and use it to write the equation of variation) if y = 3 when x = 2 .
23 3 , so y
4 4k x= =
5-3:
c: Use the equation from part (b) to find y when x = -3.
274
y =
Assignment
Pg 230 #5-4 TO 5-12
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