exam Maths Puzzle Numerical Ability

Solve the systems of equations by graphing. Then classify the system as consistent or inconsistent and the equations as dependent or independent
2x-6y=42
3x-9x=-21

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exam Other Question

6x-4y-3z=-35
3x-2y+2z=-14
-2x-3y+6z=-5

What does the variable equal? I need help with this problem

A local hamburger shop sold 639 hamburgers and cheeseburgers on Tuesday. They sold 61 fewer cheeseburgers than hamburgers. How many hamburgers did they sell?