Class 9 Maths · Chapter 13 · CBSE / NCERT
Two Variables, One Line
Linear equations in two variables. You’ll learn to graph them as lines, read slope and intercept, and solve a pair of equations by substitution, elimination and drawing graphs.
12 short lessons · about 53 minutes in all
What you’ll learn
- 1Writing a two-letter equation from a story4 min
- 2Tidying an equation into standard form4 min
- 3What counts as a solution4 min
- 4The line that pictures an equation4 min
- 5Slope: how steep a line is4 min
- 6Reading slope and starting point off an equation4 min
- 7Two equations for two unknowns4 min
- 8Solving by swapping one letter for another5 min
- 9Solving by making a letter vanish5 min
- 10Counting solutions with ratios5 min
- 11Solving a pair by drawing both lines5 min
- 12Turning a word problem into two equations5 min
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Writing a two-letter equation from a story · about 4 minutes
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More Class 9 Maths
The other 13 chapters.
CH 1Orienting Yourself: The Use of Coordinates8 lessonsCH 2Introduction to Linear Polynomials9 lessonsCH 3The World of Numbers10 lessonsCH 4Exploring Algebraic Identities9 lessonsCH 5I’m Up and Down, and Round and Round10 lessonsCH 6Measuring Space: Perimeter and Area10 lessonsCH 7The Mathematics of Maybe: Introduction to Probability9 lessonsCH 8Predicting What Comes Next: Exploring Sequences and Progressions9 lessonsCH 9Propositions and their Converses12 lessonsCH 10How Quantities Combine: Understanding Data10 lessonsCH 11The World of Algorithms10 lessonsCH 12Quadrilaterals11 lessonsCH 14Math of Space: Surface Area and Volume10 lessons
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