3x - 4y - 15 = 0 ; y + x + 2 = 0
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3x-4y-15=0______1
y+x+2=0 ________2
multiply eqn 2 by 3
3×(y+x+2=0)
3x+3y+6=0 ______3
eliminate eqn 1&3
3x-4y-15=0
3x+3y+6=0
7y=21
y=3
put y=3 in eqn_____1
3x-4y-15=0
3x-4(3)-15 =0
3x-12-15 =0
3x-27 =0
x =3/27
x=9
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