3 years ago

How to do word problem 7

1 answer:

3 0

You would buy two binders which would equal $10 and the three notebooks that cost $6 so in total it would be $16
So 16-6=10 which would be two binders since each one cost $5
Hope this helps! :)

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vova2212 [387]

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$\left\{\begin{array}{ccc}12x + 4y = 40&|:4\\17x-y=50\end{array}\right\\\underline{+\left\{\begin{array}{ccc}3x + y = 10\\17x-y=50\end{array}\right}\ \text{add both side of equations}\\.\qquad20x=60\qquad|:20\\.\qquad x=3$

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