11x+15y+23=0 ; 7x-2y-20=0 solve by substitution
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11x+15y+23=0
11x=-23-15y
23-15y/11=x
7x-2y-20=0
7{23-15y/11} -2y-20=0
161-105y/11 -2y-20=0
161-105y-22y/11=20
161-127y/11=20
161-127y=220
-127y=220-161
y=-59/127
musu2130:
ok
you forgotten me....o_o
no
never
ok dear good night @golumolu
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