The only ones I can't Get, math problems?

x+6y=7

3x-6y=1

find x & y

-13x-17y=15

x+y= -3

-5x+2y=-2

3x-5y=43

-7x-9y=-15

-3x-9y=1

11x+18y=-24

22x-15y=20

these were the only ones i couldn't get. i got a lot of fractions but when i checked the problems it didn't work. so lets see if what you got matches mt answers.

3 Answers

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  • Anonymous
    1 decade ago
    Favorite Answer

    what grade are you in?

    im in 9th grade math but rly 10th grade...

    i think im learning this now...

    6(x+6y=7) -6x+36y=42

    -6(3x-6y=1) + -18x+36y=-6

    24x=36

    when it doesn't say either x= or y= you have to multiply to find the answerr but in this case it wroks out like shyt so IDFK, but i tried

  • Anonymous
    1 decade ago

    instead of solving all of these, i will do the 'first' one, so that you get the idea :)

    so first you have x + y = -3 which can be rearranged to

    x = -3 - y

    the second equation you were give nwas -13x - 17y = 15

    now all you need to do is variable substitution.

    since x = -3 - y, sub that x value into the second equation. this gives you:

    -13 (-3 - y) - 17y = 15

    0 = 39 + 13y - 17y - 15

    0 = -4y + 24

    4y = 24

    **y = 6** and you already know that x = -3 - y

    therefore, x = -3 - (6)

    = -9

    therefore (x,y) = (-9, 6) hope this helps ^_^

  • 1 decade ago

    For the first just find what x is and and placxe that value into the first equation... answers x = -3 and y= 10/6

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