Gabby and Sydney bought some pens and pencils. Gabby bought 4 pens and 5 pencils for 6.71. Sydney bought 5 pens and 3 pencils for 7.12. Find the cost of each

In the diagram, the ratios of two pairs of corresponding sides are equal to prove that almn - axyz by the sas similarity theorem, it also needs to be shown that x 6 z un z zz un = 2x zləzz lezy