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How do I solve this bonus? (Honors Geometry)

How do I solve this bonus? (Honors Geometry)-example-1

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3x+y=180
x+2y=180

x= 180-2y
3(180-2y)+y=180
540-6y+y=180
360=5y
y=72

x+2*72=180
x=36

(36,72)
User Eric Nord
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