Explanation:
-2x-2y = -6
-2x=-6+2y
x=-6+2y/-2-------1
putting value of x in equation 3x+4y=
3*(-6+2y/-2) + 4y = 8
-18+6y/-2 + 4y = 8
-18+6y+4y = -16
-18+10y = -16
10y = 2
y = 1/5
putting value of y in equation -2x-2y = -6 we get
-2x-2*1/5 = -6
-2x-2/5 = -6
x-2/5 = 3
x = 3+2/5
x= 15+2/5 = 17/5
Hence value of x = 17/5
y = 1/5