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poizon [28]
2 years ago
9

Solve by substitution 3x-4y=-4 y=2x-4

Mathematics
1 answer:
dybincka [34]2 years ago
7 0

Answer:

x=4 and y=4

Step-by-step explanation:

From first function we have:

3x - 4y =  - 4 \\ 4y = 3x  + 4

And from the second one:

y = 2x - 4 \\ 4y = 8x - 16

Substitute them:

4y = 3x + 4 \\ 4y = 8x - 16 \\  \\ 0 =  - 5x + 20 \\ x = 4 \\ y = 4

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