Answer:
y = 20, x = 54
Explanation:
2x - 4y = 28
5x + 6y = -10
10x - 20y = 140
10x + 12y = -20
8y = 160
y = 20
2x - 4(20) = 28
2x - 80 = 28
2x = 108
x = 54
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