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6 December, 17:57

Solve the system

4x+2y=7 y=5x

A. (1,5)

B. (3,15)

C. (2,10)

D. (0.5,2.5)

Answers (1)
  1. L
    6 December, 18:10
    0
    Just do a direct substitution.

    Replace 'y' with '5x'

    4x + 2 (5x) = 7

    4x + 10x = 7

    14x = 7

    x = 7/14 = 1/2

    Sub into y=5x to find 'y'

    y = 5 (1/2) = 5/2 = 2.5

    Answer:

    x = 0.5, y = 2.5
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