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Math Help - Linear Equation Help

  1. #1
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    Exclamation Linear Equation Help

    Hey everybody, i really need some help quick.

    Im having trouble with linear equations. If anyone can show me how to solve them that would be great.

    3x + 5y = 26
    2x - y = 13




    x - 2y = -12
    3x + 8y = 34



    I also need help on these.

    2x - 3y = 4
    .02x + .01y = .52




    Last but not least...

    Terry did all 25 problems on the test and got an 85. Scores are computed by giving 4 points for each right answer and subtracting 1 point for each wrong answer. How many problems did Terry get right and wrong?

    Varibles:

    Equation:
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  2. #2
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    Quote Originally Posted by misfitgirl16 View Post
    Hey everybody, i really need some help quick.

    Im having trouble with linear equations. If anyone can show me how to solve them that would be great.

    3x + 5y = 26
    2x - y = 13
    In second equation solve for 'y':
    y=-13+2x
    Subsitute into first,
    3x+5(-13+2x)=26
    3x-65+10x=26
    13x-65=26
    13x=91
    x=7
    Thus,
    y=-13+2(7)=-13+14=1
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  3. #3
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    Quote Originally Posted by misfitgirl16 View Post
    x - 2y = -12
    3x + 8y = 34
    In first solve for 'x':
    x=2y-12
    Substitute into second,
    3(2y-12)+8y=34
    6y-36+8y=34
    14y-36=34
    14y=70
    y=5
    Thus,
    x=2y-12=2(5)-12=10-12=-2
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  4. #4
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    Thank you so much! i appreciate it
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