a]
równanie AB;
y=ax+b
-1=-3a+b
1=4a+b
b=3a-1
1=4a+3a-1
7a=2
a=2/7
.......
b=3*2/7-1=6/7-7/7=-1/7
y=2/7x-1/7
.................
a=-7/2
...........
7=-7/2*3+b
b=7+10,5=17,5
równanie;
y=-3,5x+17,5
b]
-3=-5a+b
-6=b
-3=-5a-6
5a=-6+3
a=-⅗
a=+5/3
-1=2×5/3+b
b=-1-10/3
b=-13/3
y=5/3x-13/3
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a]
równanie AB;
y=ax+b
-1=-3a+b
1=4a+b
b=3a-1
1=4a+3a-1
7a=2
a=2/7
.......
b=3*2/7-1=6/7-7/7=-1/7
y=2/7x-1/7
.................
a=-7/2
...........
7=-7/2*3+b
b=7+10,5=17,5
równanie;
y=-3,5x+17,5
b]
y=ax+b
-3=-5a+b
-6=b
-3=-5a-6
5a=-6+3
a=-⅗
.................
a=+5/3
-1=2×5/3+b
b=-1-10/3
b=-13/3
y=5/3x-13/3