4x + 7y =50 x = -y + 8 I NEED HELP!!

Question

4x + 7y =50 x = -y + 8
I NEED HELP!!

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Diễm Thu 2 months 2021-09-02T15:40:00+00:00 2 Answers 0 views 0

Answers ( )

    0
    2021-09-02T15:41:24+00:00

    Answer:

    (2, 6 )

    Step-by-step explanation:

    Given the 2 equations

    4x + 7y = 50 → (1)

    x = – y + 8 → (2)

    Substitute x = – y + 8 into (1)

    4(- y + 8) + 7y = 50 ← distribute and simplify left side )

    – 4y + 32 + 7y = 50

    3y + 32 = 50 ( subtract 32 from both sides )

    3y = 18 ( divide both sides by 3 )

    y = 6

    Substitute y = 6 into (2) for corresponding value of x

    x = – 6 + 8 = 2

    solution is (2, 6 )

    0
    2021-09-02T15:41:35+00:00

    Answer:  (x, y) = (2, 6)

    This means x = 2 and y = 6 pair up together

    =========================================================

    Explanation:

    Since x = -y+8, we can replace every copy of x with (-y+8) and we get

    4x+7y = 50

    4(-y+8)+7y = 50

    -4y+32+7y = 50

    3y+32 = 50

    3y = 50-32 …. subtracting 32 from both sides

    3y = 18

    y = 18/3 …. dividing both sides by 3

    y = 6

    Use this y value to find x

    x = -y+8

    x = -6+8

    x = 2

    So we have the solution (x, y) = (2, 6)

    If you were to graph the original two equations on the same xy coordinate grid, you should find that they intersect at (2,6).

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