In the xy plane, does the equation y=3x+2 contain point (r,s)?
1) (3r+2-s)(4r+9-s)=0
2)(4r-6-s)(3r+2-s)=0
1) (3r+2-s)(4r+9-s)=0
2)(4r-6-s)(3r+2-s)=0
Hey Gmatgirl !
I think that the answer is C.
First, let's rephrase the question. We get - does S=3r+2?
1)S=3r+2 or S=4r+9 insufficient
2)S=4r-6 or S=3r+2, insufficient
Combining 1 and 2 we get S=3r+2. Sufficient.
