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natali 33 [55]
2 years ago
12

3x - y = 7

Mathematics
1 answer:
nataly862011 [7]2 years ago
6 0
3x - y = 7
6x - y = 10

if you subtract the second equation from the first to eliminate y you get:
3x-y-(6x-y)=7-10
3x-y-6x+y=-3
-3x=-3

so option C) -3x=-3 is the solution

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