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(0,0) ( 3,-6)
y=ax+b
0=0*a+b
-6=3a+b
b=0
-6=3a+0
3a=-6
a=-6/3
a=-2
y=-2x
b]
3=4a+b
-2=-6a+b
b=3-4a
-2=-6a+3-4a
10a=3+2
a=5/10
a=1/2 b=3-4*1/2=3-2=1
y=1/2x+1