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Explanation & 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)
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