how do you solve this equation ? solving simultaneous equations by substitution 9x – 2y = -1 2y = 3x – 5

Question

how do you solve this equation ?
solving simultaneous equations by substitution
9x – 2y = -1
2y = 3x – 5

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Thành Đạt 3 years 2021-08-13T18:07:43+00:00 1 Answers 4 views 0

Answers ( )

  1. Bo
    0
    2021-08-13T18:09:38+00:00
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    Answer:

    x= -1

    y= -4

    Step-by-step explanation:

    9x-2y= -1………equation 1

    2y= 3x-5……….equation 2

    From equation 2

    2y= 3x -5

    y= 3x-5/2

    Substitute 3x-5/2 for y in equation 1

    9x -2(3x-5/2)= -1

    9x -(3x-5)= -1

    9x -3x+5= -1

    6x= -1-5

    6x= -6

    x= -6/6

    x= -1

    Substitite -1 for x in equation 2

    2y= 3(-1)-5

    2y = -3-5

    2y = -8

    y = -8/2

    y= -4

    Hence x = -1 and y= -4

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