Question 919988
I will Start You out by finding one variable: Plug and Play to find the Other.
1) 
-2(3x+y= 2)
 <u>9x+2y= 7</u>
6x = 9, x = 3  {{{3x+y = 2}}}, {{{3*3 +y = 2}}}, y = -7
(3, - 7) the Solution this System
........... 
 2)
 x-y=- 7
 <u>3x+y= 19 </u>
4x = 12, x = 3
..........
 3) 
2(4x+y= 6)
<u> x-2y= 15</u>
9x = 27, x = 3
......... 
 4) 
-2(2x+y= 10)
 <u>4x+2y= 5 </u>
 0 &#8800; -15 NO Solution
.........
 5) 
-3(-x+3y= -2)
 <u>-3x+9y= -6</u>
 0 = 0 Infinte Solutions (Same Line)