wyznacz rownanie prostej A(3,1) B(4,5)
y=ax+b
1=3a+b b=1-3a
5=4a+b
5=4a+1-3a
4=a
-11=b
y=4x-11
A=(3;1)
B=(4;5)
x1=3
y1=1
x2=4
y2=5
1=3a+b
5=4a+b /-b
5-b=4a /-5
-b=4a-5 /*(-1)
b=-4a+5
1=3a-4a+5 /-5
-4=-a
a=4
b=-4*4+5
b=-16+5
b=-11
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y=ax+b
1=3a+b b=1-3a
5=4a+b
5=4a+1-3a
4=a
-11=b
y=4x-11
A=(3;1)
B=(4;5)
x1=3
y1=1
x2=4
y2=5
y=ax+b
1=3a+b
5=4a+b /-b
5-b=4a /-5
-b=4a-5 /*(-1)
b=-4a+5
1=3a-4a+5 /-5
-4=-a
a=4
b=-4*4+5
b=-16+5
b=-11
a=4
b=-11
y=4x-11