- A
- B
- C
- D
Step-by-Step Solution
✓. Substituting (2, 5) in the others gives 12, −1 and −8 — watch both which variable carries the 2 and the signs.
Answer: D)
The pair (2, 5) is a solution of which of these equations?
Class 9Linear Equations in Two VariablesLinear Equations
Key idea: What does a 'solution' look like?
For an equation in TWO variables, a solution is a PAIR , not a single number.
Example: . Try (1, 5): ✓. So (1, 5) is a solution.
Try (0, 7), (2, 3), (3, 1), (−1, 9) — all work. There are infinitely many. Two variables, one equation → one degree of freedom remaining.
Example: . Try (1, 5): ✓. So (1, 5) is a solution.
Try (0, 7), (2, 3), (3, 1), (−1, 9) — all work. There are infinitely many. Two variables, one equation → one degree of freedom remaining.
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