Solve Graphically $15 \mathrm { ft } ^ { 3 }$

question 34

Multiple Choice

Solve graphically. In a concrete mix, there is four times as much gravel as concrete. The total volume is $15 \mathrm { ft } ^ { 3 }$ . How much of each is in the mix if
X = the amount of concrete
Y = the amount of gravel
The equations are $\begin{array} { l } y = 4 x \\x + y = 15\end{array}$

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