Odpowiedź :
Zad. 1
y=3x+9
a=3
y=3x+b
-4=3·(-2)+b
-4=-6+b
-b=-6+4
-b=-2 |·(-1)
b=2
y=3x+2
Zad. 2
y=-5x-2
a·(-5)=-1
a=1/5
y=1/5x+b
-1=1/5·2+b
-1=2/5+b
-b=2/5+1
-b=1 2/5 |·(-1)
b=-1 2/5
y=1/5x-1 2/5
Zad. 1
y=3x+9
a=3
y=3x+b
-4=3·(-2)+b
-4=-6+b
-b=-6+4
-b=-2 |·(-1)
b=2
y=3x+2
Zad. 2
y=-5x-2
a·(-5)=-1
a=1/5
y=1/5x+b
-1=1/5·2+b
-1=2/5+b
-b=2/5+1
-b=1 2/5 |·(-1)
b=-1 2/5
y=1/5x-1 2/5