Write a two-variable equation to model the following situation: Spiffy the puppy gains y pounds in x days at a rate of 2 pounds in 8 days. (Please show work when answering.)

Which is a logical conclusion based on the given information? a. figure abcd is a rhombus by the definition of a rhombus. b. segment ac is congruent to segment dc by cpctc. c. angle acb is congruent to angle adc by the angle-side-angle theorem. d. triangle acd is congruent to triangle cab by the hypotenuse-leg theorem.