Graphical and algebraic methods, consistency, applications.
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Q1 · Pair of Linear Equations in Two Variables · MEDIUM
If the pair of linear equations 2x + 3y = 7 and 2x + ky = 8 has no solution, then k equals:
Q2 · Pair of Linear Equations in Two Variables · EASY
The pair of equations x + 2y = 5 and 3x + 6y = 15 has:
Q3 · Pair of Linear Equations in Two Variables · HARD
Five years ago, A was thrice as old as B. Ten years later, A will be twice as old as B. What is the present age of A?