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2009-12-15T18:25:39+01:00
Y=ax+b
a + b =3

a) A (0;4)
(a + b =3
(4=0a+b
b=4
a= -1
y= -x+4

b) (0,3)
(a + b =3
(3=0a+b
b=3
a=0
y=3

c) A(0,0)
(a + b =3
(0=0a+b
b=0
a=3
y=3x

d A(o,-6)
(a + b =3
(-6=0a+b
b= -6
a=9
y=9x -6
4 4 4