Answer:
y = x
Step-by-step explanation:
Given that the quantities vary directly then the equation relating them is
y = kx ← k is the constant of variation
To find k use either of the 2 given points
Using (12, 9), that is x = 12 when y = 9, then
k = = =
y = x ← equation of variation
2 * 0.75 + 0.50 + 4 * 1.25
$7.00
Expression
Evaluate
1.50 + 0.50 + 5.00
(x-20)(x+3)