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8
Adding gives 2x=16.
Class 8 · Bangla Version · Mathematics
Equations, patterns and functions
Solve simultaneous equations and connect their solution to an intersection.
About this lesson and its coverage
Original Kidemy Class 8 progression. This level has its own text, examples and questions. Curriculum versions share the progression; complete board-specific coverage still needs specification matching and additional material.
Learn the idea
Two linear equations in two unknowns can be solved by elimination or substitution. A solution must satisfy both equations. On a graph it is the intersection, provided the lines are not parallel or identical.
Worked example
x+y=9 and x−y=3 add to 2x=12, so x=6 and y=3.
- Identify the quantities and restrictions.
- Show a method with units or symbols.
- Check and explain the result.
Your written practice
Show your working on paper. Check your answer, then choose Next.
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3
11−8=3.
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5
x²=25.
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Many pairs can satisfy a single relation unless extra restrictions apply.
Give an example or explain a free choice.
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2x+1=−x+7 gives x=2,y=5.
Check both line equations.
Progress and browser storage
Notebook challenge, sources and further study
Apply the idea
Solve a two-variable ticket problem and verify both the total count and value.
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- Use the stated evidence or givens.
- Show reasoning rather than only a result.
- Review and explain one correction.
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