Question

If x and y are two different real numbers and rx=ry then r=

(a) 0
(b) 1
(c) x/y

Answer 1

hint:

rx = ry

rx - ry = 0

r(x - y) = 0

I'll let you finish

Answer 2

0

Answer 3

um.....0...

Answer 4

r(x - y) = 0

r = 0 or x - y = 0

r = 0 or x = y

but we're told that x doesn't equal y, so x = y is false

Answer 5

this means that r = 0 is the only thing that's left to be true