Let's multiply the first equation by -2 so that we can eliminate y.
-2x-4y=-20
3x+4y=8
X=-12
Since X is -12, let's plug it in to the equation to check.
-12+2y=10
2y=22; let's divide
y=11
So, D (-12,11)
Answer from: Quest
Answer d; a supplementary angle = 180°, so if that angle = 150°, y would = 30°.
Answer from: Quest
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