Tan is opposite÷ adjacent.
So tan(d) = 7÷24. It is already in the simplest form.
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Divide everything by 4 getting:
7y=3x+21
then get all of the variables on one side by subtracting 3x:
7y-3x=21
Pythagorean theorem a^2+b^2=c^2
They’re complimentary angles (add up to 90)
The answer is y=-8 I’m pretty sure