a) y=ax+b
1=a+b
5=2a+b
1-5=a-2a
-4=-a
a=4
1=4+b
b=-3
y=4x-3
b)
y=ax+b
-3=-2a+b
-5=-4a+b
-3+5=-2a+4a
2=2a
a=1
-3=-2+b
b=-1
y=x-1
c)
2=1/2a+b
6=-1/2a+b
2-6=1/2a+1/2a
-4=a
2=-2+b
b=4
y=-4x+4
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a) y=ax+b
1=a+b
5=2a+b
1-5=a-2a
-4=-a
a=4
1=4+b
b=-3
y=4x-3
b)
y=ax+b
-3=-2a+b
-5=-4a+b
-3+5=-2a+4a
2=2a
a=1
-3=-2+b
b=-1
y=x-1
c)
y=ax+b
2=1/2a+b
6=-1/2a+b
2-6=1/2a+1/2a
-4=a
2=-2+b
b=4
y=-4x+4