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anonymous

  • 5 years ago

Terrible at math, need help with college algebra.

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  1. anonymous
    • 5 years ago
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    ...Which part of college algebra?

  2. anonymous
    • 5 years ago
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    The Substitution Method Solutions to Systems of Linear Equations Applications of the Substitution Method

  3. anonymous
    • 5 years ago
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    Okay, say you have two linear equations that need solving.\[a*x + b*y = c\] and \[d*x+e*y=f.\] Now, you solve one equation for x:\[x = (c-b*y)/d.\] Plug that value for x into your second equation, and solve for a value of y.

  4. anonymous
    • 5 years ago
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    After you have that value of y, you plug it back into either equation, and you'll get the value of x. :)

  5. amistre64
    • 5 years ago
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    its really simpler than it looks :)

  6. anonymous
    • 5 years ago
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    (Assuming a-f are regular constants.)

  7. anonymous
    • 5 years ago
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    So for x-2y=1 3x+12y+15 i am suppossed to find whether the lines are parallel or coinciding...

  8. anonymous
    • 5 years ago
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    You mean, 3x+12y = 15?

  9. amistre64
    • 5 years ago
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    It depends on what is being asked for in the problem.

  10. amistre64
    • 5 years ago
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    oh...that is the problem..thought it was a question lol

  11. anonymous
    • 5 years ago
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    yes and i have to write these in slope intercept form

  12. anonymous
    • 5 years ago
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    If they coincide, or are the exact same line, then one equation will be the same as the other equation -- just multiplying every term by the same factor.

  13. amistre64
    • 5 years ago
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    do you know how to solve each equation for "y"?

  14. amistre64
    • 5 years ago
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    x - 2y = 1; how would you solve for "y"?

  15. anonymous
    • 5 years ago
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    I amnot sure....

  16. amistre64
    • 5 years ago
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    we have to go back to the basics of equations with this; we want to get that "y" all by itself on one side of the equation and everything else to the other side; does that sound familiar?

  17. amistre64
    • 5 years ago
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    the basic rule of thumb is: whatever you do to one side, HAS to be done to the other inorder for it to stay equal.

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