Question 251016
y=mx+b
with a slope of 2  we now have
y=2x+b
since the point is (0,-1)
we plug them in  and solve for b
-1=2(0)+b
-1=b
so now we have y=2x-1
so now we just plug in the ordered pairs to see which give equalities

(2, 1)
y=2x-1
1=2*2-1
1=4-1
1=3
not on the line

(1, 1)
y=2x-1
1=2*1-1
1=2-1
1=1 yes on the line

(0, 1)
y=2x-1
1=2*0-1
1=-1
not on the line