ax+b=y
{a+b=-4 /*-1
{8a+b=4
{-a-b=4
7a=8
a=8/7
a+b=-4
8/7+b=-4
b=-4-8/7
b=-4-1 1/7
b=-5 1/7
b=-36/7
więc:
y=8/7x - 36/7
y=ax+b
{-4=a+b /*(-1)
{4=8a+b
{4=-a-b
---------+
8=7a
7a=8 /:7
4=-8/7-b
b=-28/7 - 8/7
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ax+b=y
{a+b=-4 /*-1
{8a+b=4
{-a-b=4
{8a+b=4
7a=8
a=8/7
a+b=-4
8/7+b=-4
b=-4-8/7
b=-4-1 1/7
b=-5 1/7
b=-36/7
więc:
y=8/7x - 36/7
y=ax+b
{-4=a+b /*(-1)
{4=8a+b
{4=-a-b
{4=8a+b
---------+
8=7a
7a=8 /:7
a=8/7
4=-8/7-b
b=-4-8/7
b=-28/7 - 8/7
b=-36/7