Question

You are in charge of buying soda and water for the school picnic. A case of soda costs $6.00 and a case of water costs $5.00. (a) If x represents the number of cases of soda and y represents the number of cases of water, write an equation for a purchase that totals $135. (b) If you bought 10 cases of soda, determine the number of cases of water purchased.

Answer 1

A)

we will write the equation

$6x+5y=135$

B) x=10, we just replace the x and solve y

$\begin{gathered} 6(10)+5y=135 \\ 60+5y=135 \\ 5y=135-60 \\ 5y=75 \\ y=\frac{75}{5} \\ y=15 \end{gathered}$

the number of cases of water ir 15