Query about Question 5 from "PrepSwift: System of Equations" [3376]

GRE GRE Quant Problem Solving
1

https://prepswift.gregmat.com/quizzes/quiz/prepswift-system-of-equations (Question 5)

Hi team,

The prepswift note under the video for this topic says:
”Systems of equations are solvable if the number of variables in each equation equals the number of equations in the set.”
In the question though, 2nd equation has 2 variables instead of 3. So the property above doesn’t hold true, right? If it doesn’t, why is the equation solvable?

I do understand how we solved this question but I want to know about the property above since its confusing me.

Thanks :slight_smile:

2

Systems of equations are solvable if the number of variables in each equation equals the number of equations in the set

There’s more than that though, which in this case is crucial.