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For numbers 7 to 9, refer to the problem below.
Carl bought 10 big notebooks and 15 small notebooks. The total amount he paid was at most Php 550.00. Let x be the cost of big notebooks and y is the cost of small notebooks.
![For Numbers 7 To 9 Refer To The Problem BelowCarl Bought 10 Big Notebooks And 15 Small Notebooks The Total Amount He Paid Was At Most Php 55000 Let X Be The Cos class=](https://ph-static.z-dn.net/files/ddf/fc0d5282c095ff8ce61cdd5daacf1d21.jpg)