znajd rownanie prostej przechodzacej przez punkt A=(2,-5) B(-4,2)
y=ax+b
-5=2a+b
2=-4a+b
2a+b=-5 /*2
-4a+b=2
4a+2b=-10
-4a+2b=2
4b=8 /:4
b=2
2a+b=-5
2a+2=-5
2a=-5-2
2a=-7 /:2
a=3,5
y=3,5x+2
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y=ax+b
-5=2a+b
2=-4a+b
2a+b=-5 /*2
-4a+b=2
4a+2b=-10
-4a+2b=2
4b=8 /:4
b=2
2a+b=-5
2a+2=-5
2a=-5-2
2a=-7 /:2
a=3,5
y=3,5x+2