Answer:

Step-by-step explanation:
Let
and
be two rational numbers, where b and d are not zero and a, b, c and d are integers.
1. Given:

2. Multiply to get a common denominator :

3. Simplify:

4. Since
then 
If
are integers, then
are integers too. So the fraction

is a rational number
Answer:
Step-by-step explanation:
(6,3) m = 1/2
b = y - (m)(x)
b = -3 - (1/2)(6)
b = -3 - 3
b = -6
y = 1/2x - 6