In some cases, neither of the two equations in the system will contain a variable with a coefficient of 1, so we must take a further step to isolate it. Let's say we now have

3C+4D=5

2C+5D=2

None of these terms has a coefficient of 1. Instead, we'll pick the variable with the smallest coefficient and isolate it. Move the term with the lowest coefficient so that it's alone on one side of its equation, then divide by the coefficient.

Which of the following expressions would result from that process?

a. C=53−43D

b. C=1−52D

c. D=25−25C

d. D=54−34C