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jagr2713

  • one year ago

3x+6y=12 -9x+y=21

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  1. jagr2713
    • one year ago
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    @Nnesha

  2. anonymous
    • one year ago
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    you have to make the variable match in both equations. The easiest way to do that would be multiply the first equation by 3

  3. pooja195
    • one year ago
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    What do you need to do?

  4. jagr2713
    • one year ago
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    don't we change the first equation into y-mx+b

  5. pooja195
    • one year ago
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    −9x+y+9x=21+9x(Add 9x to both sides) y=9x+21

  6. Nnesha
    • one year ago
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    it depends on the statement substitution , elimination/addition , or graphing ?

  7. pooja195
    • one year ago
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    ^thats what i meant to ask.

  8. jagr2713
    • one year ago
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    substitution

  9. pooja195
    • one year ago
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    aight so continue with this −9x+y+9x=21+9x(Add 9x to both sides) y=9x+21

  10. pooja195
    • one year ago
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    Now that you know what y equals plug it into equation 1 3x+6(9x+21)=12 solve for x

  11. jagr2713
    • one year ago
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    oh I did it the other way lol

  12. Nnesha
    • one year ago
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    \(\color{blue}{\text{Originally Posted by}}\) @jagr2713 don't we change the first equation into y-mx+b \(\color{blue}{\text{End of Quote}}\) not necessarily, you don't have to write in slope intercept you can solve for x too.

  13. pooja195
    • one year ago
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    ok well what did u get for x?

  14. jagr2713
    • one year ago
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    um -2 so now we plug it into y=9(-2)+21 y=3

  15. pooja195
    • one year ago
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    Correct

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