Algebra

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How do you solve and graph these equations?

y = 4x + 5
x - 2y = 4

  • Algebra -

    y = 4 x + 5, through (0,5) slope 4

    2y = x - 4
    y = (1/2) x - 2 , through(0,-2) slope (1/2)

    now subtract second from first to get rid of y
    0 = 3.5 x +7
    x = -2
    then y = -8+5 = -3
    so they cross at (-2,-3)
    check
    y = 4x + 5
    -3=4(-2)+5??
    -3=-8+5 yes
    x - 2y = 4
    -2 -2(-3) =4 ??
    -2 +6 = 4 sure enough

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