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

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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Lydia 3 weeks 2021-09-25T23:22:16+00:00 1 Answer 0

Answers ( )

    0
    2021-09-25T23:23:42+00:00

    Answer:

    x = -9

    y = -3

    Step-by-step explanation:

    We can first multiply the 2nd equation by -6, so we have:

    -6*[-0.8x+0.4y=6]\\=4.8x-2.4y=-36

    Now, we add up this equation to the 1st equation given to eliminate y and solve for x. Shown below:

    1.2x+2.4y=-18\\4.8x-2.4y=-36\\---------\\6x=-54\\x=-9

    So, we have the value of x to be -9

    Now, we substitute this value in 1st equation and solve for y:

    1.2x+2.4y=-18\\1.2(-9)+2.4y=-18\\-10.8+2.4y=-18\\2.4y=-7.2\\y=-3

    The value of y is -3

    So,

    x = -9

    y = -3

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45:7+7-4:2-5:5*4+35:2 =? ( )