Napisz równanie prostej przechodzącej przez punkty (-3,2)(4,-1)
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y=ax+b
(-3,2), (4,-1)
2=-3a+b
-1=4a+b /*(-1)
-3a+b=2
-4a-b=1
_______
-7a=3
a=-3/7
a=-3/7
-3a+b=2
a=-3/7
-3*(-3/7)+b=2
a=-3/7
9/7-2=-b
a=-3/7
-b=1 i 2/7 - 2
a=-3/7
-b=-5/7
a=-3/7
b=5/7
y=-3/7 x + 5/7
lub (czytelniej ;])