Algebra 2

i need help solving the problem
3x+y=-1
2x+3y=18
using substitution

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  1. 3x+y=-1
    y = -1 -3x

    2x+3y=18
    2x + 3(-1-3x) = 18
    2x - 3 - 9x = 18
    -7x = 21
    x = -3

    Substitute -3 for x in the first problem to find the value of y.

  2. matrix[2x,0
    4,-y]=matrix[4,0
    4,1]

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