Fireflame13
7x+4y=-4
5x+8y=28
elimination/solve. multiplacation or addition subtraction.
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Mertsj
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Multiply the top equation by -2.
Add the result to the bottom equation.
Fireflame13
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14x+8y=-8?
Fireflame13
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..............
PhoenixFire
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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.
Fireflame13
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9x=20
Fireflame13
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!
Fireflame13
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mersj...
PhoenixFire
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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.
Fireflame13
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.....i have no words to express my gratitude.