Answer:
D
18y = 306
y = 25 - x
Explanation:
y is the number of 18-inch containers.
1 18-inch container occupies 18 inches
y number of 18-inch containers occupy 18y inches.
We are told that the 18-inch containers occupy 306 inches.
The gives us one equation:
18y = 306 Equation 1
There are 25 containers altogether. x number of them are 12 inches. y number of them are 18 inches. This give us the second equation.
x + y = 25
Now we solve the second equation for y.
y = 25 - x Equation 2
Put Equations 1 and 2 together, and you have a system of equations.
18y = 306
y = 25 - x
Answer:
D
18y = 306
y = 25 - x