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31 May, 10:51

8x - 6y=-16

5x + y = 28

In using Elimination?

+4
Answers (2)
  1. 31 May, 11:52
    0
    Multiple (5x+y = 28) by 6 giving you 30x + 6y = 168 and then you would add the two equations together, giving you 38x = 152, divide both sides by 38, giving you 4. after this, you would sub x=4 into one of the equations (i'm using the 5x + y = 28) which would give me 20 + y = 28, subtract 20 by both sides, giving you y = 8. so your answer is (4,8)
  2. 31 May, 13:05
    0
    x=4

    y=8

    Step-by-step explanation:

    8x - 6y=-16 Equation 1

    5x + y = 28 Equation 2

    To solve with elimination method

    Multiply equation 2 by 6, the coefficient of y in equation 1, so y can have the same coefficient.

    6 (5x + y = 28)

    30x+6y=168 Equation 3

    8x-6y=-16 Equation 1

    Add equation 1 and equation 3 to eliminate y

    30x+8x=38x

    6y + (-6y) = 6y-6y=0

    168 + (-16) = 168-16=152

    38x=152

    Divide both sides by 38

    38x/38=152/38

    x=152/38

    x=4

    Substitute x for 4 in equation 2

    5x + y = 28

    5 (4) + y=28

    20+y=28

    Make y the subject

    y=28-20

    y=8
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