Answer: d) q--->r
Step-by-step explanation:
This is an example of substitution. We know that p=q, and need to make p=r.
Lets assume p=3. Then q must equal 3. Then r must equal three. Thus, q=r.
If x=y and x=z then y=z
Compare with the general form of the slope intercept of a line:-
y = mx + b
slope m = 4 and y-intercept b = 7