- A−6
- B6
- C−3
- D3
Step-by-Step Solution
First check (2, −1): 2 + 2(−1) = 0 ✓. Now a + 2(3) = 0 → a + 6 = 0 → a = −6. Check: −6 + 6 = 0 ✓.
Answer: A) −6
Both (2, −1) and (a, 3) lie on the line . Find a.
Class 9Linear Equations in Two VariablesLinear Equations
Key idea: Graphing a linear equation
Three steps:
1. Find at least **two solutions** (preferably the and intercepts — easiest to plot).
2. Plot those points on the coordinate plane.
3. Draw a straight line through them.
Every linear equation in two variables graphs as a STRAIGHT LINE. (That's why they're called 'linear'.)
For accuracy: find a third solution and verify it lies on the line — catches arithmetic mistakes.
1. Find at least **two solutions** (preferably the and intercepts — easiest to plot).
2. Plot those points on the coordinate plane.
3. Draw a straight line through them.
Every linear equation in two variables graphs as a STRAIGHT LINE. (That's why they're called 'linear'.)
For accuracy: find a third solution and verify it lies on the line — catches arithmetic mistakes.
Master this chapter in 30 minutes a day.
Don't just memorise the answer — build a daily practice habit.
Practice 5 Similar Questions Free →All Linear Equations in Two Variables practice questions
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