solve by using substitution method
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2 x - 3 y + 6=0 - eqn 1
2 x + 3 y - 18=0 - eqn 2
2 x +3 y=18
2x = 18-3y
x= - eqn 3
substitute eqn 3 in eqn 1
2x - 3y +6=0
2 -3y +6 =0
18 -3y -3y +6=0
24 - 6y=0
-6y= -24
6y =24
y= 24/6 = 4
substitute y = 4 in eqn 3
x =
=
=
=
x= 3