Use elimination to solve the system of equations. 10x + 5y = 55 y – 2x = -9 A. (1,1) B. (1,5) C. (5, 1)

Question

Use elimination to solve the system of equations.
10x + 5y = 55
y – 2x = -9
A. (1,1)
B. (1,5)
C. (5, 1)
D. (4,5)

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Huyền Thanh 3 years 2021-08-12T20:58:37+00:00 1 Answers 10 views 0

Answers ( )

  1. Ben
    0
    2021-08-12T21:00:04+00:00
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    Answer:

    C. (5,1)

    Step-by-step explanation:

    10x+5y=55 equation 1

    y-2x=-9 equation 2

    y=-9+2x isolate y in equation 2

    10x+5(-9+2x)=55 substitute value of y from equation 2 into equation 1

    10x-45+10x=55

    20x=100

    x=5

    solve for y by using x value (5) in either equation

    y-2x=-9

    y-2(5)=-9

    y-10=-9

    y=1

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