??????????????? "point av intersekshun" ????????????
me ges yu meen weer 2 strate lines hit (kros)
line 1: -3x-7y=21. or 7y=-3x -21, so y=-(3/7)x -3.....
line 2: -7x -9y=63
line2...-7x -9*[-(3/7)x -3] =63
-7x +(27/7)x -27 =63
[(27-49)/7]x=63+27=90
-(22/7)x=90
x=-(7/22)*90=-630/22=-28.6363636363636363...
y=-(3/7)x-3=-0.42857142857 x -3
y=(-28.636363636) *(-0.4285714) -3
=+12.2727272727272-3
y=9.272727272727272...