Possible values are
x=1,y=11
x=2,y=8
x=3,y=5
x=4,y=2
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Answer:
It's the law of cosines
Step-by-step explanation:
law of cosines states that 
so we know that a = 7, b = 4, and alpha would be 135 degrees, so just plugging it in gets us 49+16-2*7*4*(-0.707) = 65 + 39.59 = 104.59
They would be identical so it would be 114
