### Question Description

I need help with a Algebra question. All explanations and answers will be used to help me learn.

## Final Answer

11.

subtracting 2nd equation from the 1st equation.

6x+3y =-12

6x + 2y =-4

- - +

____________

y = 8

putting the value of y=16 in 1st equation.

6x +3*8 =-12

6x =-12-24

6x = -36

x =-6

so, **x =-6 and y=8**

12.

y=2x+11

y+x =5

rewriting them,

y-2x=11

y+x=5

subtracting 2nd equation from the 1st equation.

y - 2x = 11

y + x = 5

- - -

_________

-3x = 6

x =-2

and putting the value of x = -2 in 1st equation...

y =2*-2 +11 = -4+11 =7

so, **x=-2 and y=7**

13. **(-1,0)**14.

**(-1,7)**