Jared is taking inventory of the books in his school library. The graph shows the proportional relationship between the number o
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so.. .whatever those amounts are, of "x" and "y", for the mixture,
they must add up to 100 grams, or x + y = 100
and the titanium percentage of that sum, must yield a 13 grams of titanium on those 100 grams
thus
do the substitution, and solve for "x",
what's "y" amount? well, y = 100 - x