Answer:
only (1) and (3) forms a pair of inconsistent system with x + 2y = 5.
Step-by-step explanation:
Given : a linear equation x + 2y = 5
We have to find a pair of equation that can pair with x + 2y = 5 to create an inconsistent system.
Consider a system of equation
For the system to have no solution the condition is,
We just have to check for the above condition, those pair whose x and y coefficient are in same ratio and constant coefficient are different, those pair will form an inconsistent system.
Thus, only (1) and (3) are multiple of given equation, thus forms a pair of inconsistent system.