+0

# help plz

0
30
1

A boy buys 3 apples and 1 orange juice for $\$1.35$. A girl buys an apple and 2 orange juice for$\$1.20$.  how much does an apple cost?

Feb 8, 2021

#1
+8435
0

Let $x be the cost of an apple,$y be the cost of orange juice.

$$\begin{cases}3x + y = 1.35\\x + 2y = 1.2\end{cases}\\ \begin{cases}6x + 2y = 2.7\\x + 2y = 1.2\end{cases}\\ 5x = (6x + 2y) - (x + 2y) = 2.7 - 1.2 = 1.5\\ x = 0.3\\ 0.3 + 2y = 1.2\\ y = 0.45$$

Feb 8, 2021