Stephanie adds pennies, nickels and quarters to a scale until the mass of the combined coins is $75$ grams. Each penny has a mass of $2.5$ grams, each nickel has a mass of $5$ grams and each quarter has a mass of $5.7$ grams.
Create an equation to model this situation, where $x$ is the number of pennies, $y$ is the number of nickels and $z$ is the number of quarters that Stephanie can put on the scale so that the mass of the combined coins is exactly $75$ grams.
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yaaa
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the point is like this to be in hello insta but you can make it by doing it and make me happy
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