Algebra

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5x=1/2y-1, find value of X; 1/4y=10x-1, find value of Y (use substitution)

  • Algebra -

    I assume you mean:
    5 x = (1/2) y - 1
    (1/4) y = 10 x - 1
    and we are to solve the two equations simultaneously using substitution and get for x first

    so solve the first for x as a function of y

    x = (1/10) y - 1/5

    use that x in the second equation to get y

    (1/4) y = 10 [ (1/10)y -1/5 ] - 1

    y = 4 y - 8 - 4

    3 y = 12

    y = 4

    Now use that value of y to get x
    5 x = (1/2) 4 - 1
    x = 1/5

  • Algebra -

    i need help in finding this answer
    find the value of r so that the line through (8,R) and (4,5) has a slope of negative

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