Mathematics for IGCSE & O level - Equations (Section 2 - No. 13)
How is the value of the subject variable changed in the equation by doing addition or subtraction?
The value of the subject variable remains the same.
The value of the subject variable may change.
The value of the subject variable increases.
The value of the subject variable decreases.
Объяснение
If we add a number or subtract a number, the value changes.