Răspuns :
a)y=x-7 pt x=8 rezulta y=1;
pt x=9⇒y=2
b) 2x+y=5⇒y=5-2x; pt x=2⇒y=1
pt x=1⇒y=3
c) 5x-2y=10; 2y=5x-10; y=(5x-10)/2
pt x=2⇒y=0
pt x=4⇒y=5
pt x=9⇒y=2
b) 2x+y=5⇒y=5-2x; pt x=2⇒y=1
pt x=1⇒y=3
c) 5x-2y=10; 2y=5x-10; y=(5x-10)/2
pt x=2⇒y=0
pt x=4⇒y=5