8x+ 7y =39 8x + 2y = 34 What is x and y

Question

8x+ 7y =39
8x + 2y = 34

What is x and y

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Latifah 5 months 2021-08-13T17:08:38+00:00 1 Answers 3 views 0

Answers ( )

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    2021-08-13T17:10:17+00:00

    Answer:

    y= 1 and X=4

    Step-by-step explanation:

    8x +7y =39

    8x +2y =34

    elimination method(we multiply 8x+7y=39 or 8x + 2y= 34 by -1 to eliminate 8x)

    lets multiply 8x+7y = 39 by – 1

    -8x -7y = -39

    8x +2y = 34

    (8x-8x)+(2y-7y)= (-39+34)

    0 + (-5y) = -5

    -5y= -5……dividing both sides by -5

    y = 1

    8x +2y =34……. substituting y by 1

    8x +2(1)= 34

    8x + 2= 34

    8x = 34-2

    8x = 32…..dividing both sides by 8

    x = 4

    Lets check;

    8x +2y = 34

    8(4) +2(1) = 34

    32 + 2 =34

    34 = 34

    8x + 7y = 39

    8(4) + 7(1) = 39

    32 + 7 =39

    39 = 39

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )