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March 26, 2017

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Can someone please check my work?

Solve using substitution method

1. 3x+2y=12
x=52-6y
answer:-40.8 I am pretty sure that one is wrong.

Solve using elimination method

2. 2r-7s=-31
7r+2s=24
answer: (230/53,-468/53)

3.3x+4y=3
6x+8y=6
answer: No answer. problems eliminate eachother

  • math - ,

    3(52-6y) + 2 y = 12
    156 - 18 y + 2 y = 12
    -16 y = -144
    y = 9
    x = 52 - 6(9) = 52 - 54 = -2

  • math - ,

    Thank you Damon!
    Can you help me with the formula to solve by elimination?

  • math - ,

    3x+2y=12
    x=52-6y multiply everything by 3 on this line

    3x+2y=12
    3 x = 156 - 18y
    ---------------- subtract
    0 x + 2y = 12 -156 + 18 y
    0 = - -144 + 16 y
    y = 144/16 = 9 again

  • math - ,

    2r-7s=0
    7r+2s=53

  • math - ,

    6,174,000,000

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