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MATH!

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1/2x - 1/4y= 7/2
3/4x + 1/3y= 19/2

To change into y=, do i multiply the top one by by 1/4 and the bottom one by -1/3?

  • MATH! -

    You would multiply the top one by -4 and the bottom one by +3, if you want to keep y positive.

  • MATH! -

    What do you have to multiply 1/4 by to get to 1?

    4

    1/2 x - 1/4 y = 7/2
    Multiply across by 4:
    2x - y = 14
    y = 2x -14

    Now multiply the second one across by 3 to finish it yourself.

  • MATH! -

    thank yall(:

  • MATH! -

    Well i can't seem to figure out the intersection on my calc. please help.

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