7x+4y=-4 5x+8y=28 elimination/solve. multiplacation or addition subtraction.

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7x+4y=-4 5x+8y=28 elimination/solve. multiplacation or addition subtraction.

Mathematics
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Multiply the top equation by -2. Add the result to the bottom equation.
14x+8y=-8?
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-2. not 2. You want to eliminate the 'y' term. then you solve the resulting equation for x. and substitute that value back into either of the first equations to get a value for y.
9x=20
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mersj...
7x+4y=-4 (1) 5x+8y=28 (2) -14x-8y=8 <= (1) * -2 = (3) -9x=36 <= (3) + (2) Solve for x: x=-4 Now plug -4 into either (1) or (2) and solve for y.
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