Work on a higher GRE score every day by building practice into your daily routine. We'll review the right answer in detail so that the next time you see that question type, you’ll be ready.
We can solve this system of equations by substitution. To do this, we can first get d in terms of c and solve for c. We are given d + c = 6 => d = 6 - c.Next, we plug this into the other equation to yield (6 - c) + (6 - c) = c + c + c + c => 12 - 2c = 4c
Get practice questions delivered by email every day.