The direct variation equation is y = kx.
In this case, the equation is y = 1.8x.
Substitute the given points into the equation. If the x and y coordinate of a point satisfies the equation and both sides are equal, then that point is your answer.
The 1st graph is the answer.
To answer this question you will set up a system of equations to represent each scenario. Solve for one variable and substitute that in to the other equation to find the missing value. This example will have you solving for p, the price of popcorn.
4p + 3s = 13.50 and 2p + 5s = 12
2p + 5s = 12
-2p -2p
5s = 12 - 2p
5 5
s = 2.4 - 0.4p
4p + 3s = 13.50
4p + 3(2.4 - 0.4p) = 13.50
4p +7.2 - 1.2p = 13.5
2.8p +7.2 = 13.5
-7.2 -7.2
<u>2.8p</u> = <u>6.3</u>
2.8 2.8
p = 2.25
The price of popcorn is 2.25 and the soda is (2.4 - 0.4 x 2.25) $1.50.
5 popcorn and 2 sodas will cost (2.25 x 5 + 1.50 x 2) = $14.25.
Answer:
B
Step-by-step explanation:
5 x 2 = diameter
10 x 3.14 (pie)
= 31.4 = D
