- AYes, because 2(4) + 3 = 11
- BNo, the solution is
- CNo, the solution is
- DYes, because 4 + 3 = 11
Step-by-Step Solution
Substitute , which equals the RHS. So is the solution.
Answer: A) Yes, because 2(4) + 3 = 11
Is a solution of the equation ?
Class 7Simple EquationsSimple Equations
Key idea: Translating word problems into equations
Three steps:
1. **Pick a variable** for the unknown ('let be the number of …').
2. **Translate the words into an equation** using the operations the problem describes.
3. **Solve and answer in the original units.**
Example: 'Three times a number plus 7 equals 22. Find the number.'
Let = the number. Equation: . Solve: .
Answer: the number is 5.
1. **Pick a variable** for the unknown ('let be the number of …').
2. **Translate the words into an equation** using the operations the problem describes.
3. **Solve and answer in the original units.**
Example: 'Three times a number plus 7 equals 22. Find the number.'
Let = the number. Equation: . Solve: .
Answer: the number is 5.
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