solve each system by elimination 2x=10-y y-x=-2

Question

solve each system by elimination 2x=10-y y-x=-2

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Thu Nguyệt 3 months 2021-08-15T07:56:52+00:00 1 Answers 6 views 0

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    2021-08-15T07:58:33+00:00

    Answer:

    x=4 and y=2

    2x=10−y;y−x=−2

    Rewrite equations:

    2x=−y+10;−x+y=−2

    Step: Solve2x=−y+10for y:

    2x=−y+10

    2x+y=−y+10+y(Add y to both sides)

    2x+y=10

    2x+y+−2x=10+−2x(Add -2x to both sides)

    y=−2x+10

    Step: Substitute−2x+10foryin−x+y=−2:

    −x+y=−2

    −x+−2x+10=−2

    −3x+10=−2(Simplify both sides of the equation)

    −3x+10+−10=−2+−10(Add -10 to both sides)

    −3x=−12

    −3x

    −3

    =

    −12

    −3

    (Divide both sides by -3)

    x=4

    Step: Substitute4forxiny=−2x+10:

    y=−2x+10

    y=(−2)(4)+10

    y=2(Simplify both sides of the equation)

    x=4 and y=2

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