Solve the following system of equations 1.2x+2.4y= -18 -.8x+ .4y = 6 HELP I need the answer RIGHT NOW ASAP (I spaced

Question

Solve the following system of equations
1.2x+2.4y= -18
-.8x+ .4y = 6

HELP I need the answer RIGHT NOW ASAP (I spaced it out so you could see it better)!!!!!

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Elliana 4 weeks 2021-09-25T23:09:52+00:00 1 Answer 0

Answers ( )

    0
    2021-09-25T23:11:44+00:00

    Answer:

    (x=3,y=-9)

    Step-by-step explanation:

    The given systems is;

    1.2x + 2.4y =  - 18 \\  - 0.8x + 0.4y = 6

    Divide the top equation by 1.2 and the bottom equation by by 0.8 to get:

    x + 2y =  - 15 \\  - x + 0.5y = 7.5

    Now add both new equations:

    2y + 0.5y = 15 +  - 7.5

    2.5y = 7.5

    x =  \frac{7.5}{2.5} = 3

    Let us substitute x=3 into x+2y=-15 and solve for y.

    3+2y=-15

    2y=-15-3

    2y=-18

    y=-9

    The solution is (x=3,y=-9)

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