You are baking cookies. The recipe calls for 34 cup of flour. You want to make 12 of a batch. How much flour do you need?
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Because the two angles on the right add to 180 degrees, we can create this system:
We can also prove that
, which, when solved, shows that 
.
When plugged in to the original equation, we find that y = 105 degrees.
We can also prove that
When plugged in to the original equation, we find that y = 105 degrees.