What is the value of x for 7x – 12 y = 180 / 7x = 84

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What is the value of x for 7x – 12 y = 180 / 7x = 84

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RI SƠ 4 years 2021-08-18T21:49:10+00:00 1 Answers 12 views 0

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  1. Nick
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    2021-08-18T21:50:23+00:00
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    eq^2: 7x=84 divide 84 by 7 which is 12.

    therefore x is equal to 12. Then

    1) take that 12 you got in equation 2 and substitute in equation 1 which is:

    7x-12y=180

    7(12)-12y=180

    84 -12y=180

    -12y=180-84

    -12y=96 …………divide both sides with -12

    -y=8 (×-1) both sides

    y= -8

    therefore 7(12)-12(-8)=180

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