Question 325290
I'll do the first one to get you started. You should post one problem at a time.


# 1


{{{-x-2y=11 }}} Start with the second equation.



{{{-x=2y+11 }}} Add 2y to both sides.



{{{x=-2y-11 }}} Multiply every term by -1



{{{-3x+3y=4}}} Go to the first equation.



{{{-3(-2y-11)+3y=4}}} Plug in {{{x=-2y-11 }}} 



{{{6y+33+3y=4}}} Distribute.



{{{9y+33=4}}} Combine like terms on the left side.



{{{9y=4-33}}} Subtract {{{33}}} from both sides.



{{{9y=-29}}} Combine like terms on the right side.



{{{y=-29/9}}} Divide both sides by {{{9}}} to isolate {{{y}}}.



{{{x=-2y-11 }}} Go back to the previously isolated equation.



{{{x=-2(-29/9)-11 }}} Plug in {{{y=-29/9}}}



{{{x=58/9-11 }}} Multiply



{{{x=-41/9 }}} Subtract.



So the solutions are {{{x=-41/9 }}} and {{{y=-29/9}}} which form the ordered pair *[Tex \LARGE \left(-\frac{41}{9},-\frac{29}{9}\right)]