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STatiana [176]
4 years ago
7

Will give brainliest for *BEST* answer!

Mathematics
1 answer:
Nataliya [291]4 years ago
8 0
Use substitution and substitute y into the other equation. One of the equations already gives you y in terms of x, so use that and substitute it into the other equation. y = 3x - 4

Plug into the other equation: -3y = -9x + 12 
-3(3x-4) = -9x + 12
-9x + 12 = -9x + 12
This is an identity. So that means that any value of x makes this equation true. So B.
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