Pre-Calculus

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Use substitution method to solve.

(1/2x)+(3/4y)=(-1/4) and (3/4x)-(1/4y)=1

Can you please help?

  • Pre-Calculus -

    first, I'd get rid of those pesky fractions:

    2x + 3y = -1
    3x - y = 4

    Now you can see that y = 3x-4, so substitute that back in the 1st equation:

    2x + 3(3x-4) = -1
    2x+9x-12 = -1
    11x = 11
    x = 1
    so, y=3x-4 = -1

    be sure to check that the answer fits the original equations.

  • Pre-Calculus -

    Thank you.

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