If 4p + 3q + 2r = 3 and -4p – 2q – 2r = 4, then q = ? (A) 0 (B) 2 (C) 3 (D) 4 (E) 7

Question

If 4p + 3q + 2r = 3 and -4p – 2q – 2r = 4, then q = ?

(A) 0
(B) 2
(C) 3
(D) 4
(E) 7

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Thanh Hà 4 years 2021-09-03T05:16:41+00:00 1 Answers 4 views 0

Answers ( )

  1. Nem
    0
    2021-09-03T05:18:36+00:00
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    Answer:

    E

    Step-by-step explanation:

    Label the two equations:

    4p +3q +2r= 3 —–(1)

    -4p -2q -2r= 4 —–(2)

    (1) +(2):

    4p +3q +2r -4p -2q -2r= 3 +4

    Grouping like terms together:

    4p -4p +3q -2q +2r -2r= 7

    Simplify:

    q= 7

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