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Fireflame13

  • 3 years ago

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

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  1. Mertsj
    • 3 years ago
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    Multiply the top equation by -2. Add the result to the bottom equation.

  2. Fireflame13
    • 3 years ago
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    14x+8y=-8?

  3. Fireflame13
    • 3 years ago
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    ..............

  4. PhoenixFire
    • 3 years ago
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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.

  5. Fireflame13
    • 3 years ago
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    9x=20

  6. Fireflame13
    • 3 years ago
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    !

  7. Fireflame13
    • 3 years ago
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    mersj...

  8. PhoenixFire
    • 3 years ago
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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.

  9. Fireflame13
    • 3 years ago
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    .....i have no words to express my gratitude.

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