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21 February, 14:17

How do i solve 5x+3y=-10 & 3x+5y=-6

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  1. 21 February, 17:27
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    Solve it using elimination method:

    5x+3y=-10

    3x+5y=-6

    Essentially what you would want to do is eliminate a variable so you have to multiply the two equations so that the two "y"s cancel each other out. You do this by multiplying one by a negative number and the other one a positive number. Doesn't matter what number you multiply the number with; however, both numbers need to be the same distance away from zero. Also, if you're going to multiply one term, then all the terms will need to be multiplied.

    -5 (5x+3y) = -10

    3 (3x+5y) = -6

    Distribute and Multiply:

    -25x-15y=50

    9x+15y=-18

    Now add the two equations by adding the x's together, y's, and the total.

    The y's end up canceling each other.

    -16x=32

    Divide:

    X=-2

    Now that you have "X" substitute x from one of the equations from the beginning. You may do two for checking answers.

    3 (-2) + 5y=-6

    -6+5y=-6

    5y=0

    Y=0

    The answer is:

    x=-2

    y=0

    (-2,0)
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