Linear functions are straight lines. Graph B has a straight line which means it is a linear function.
What is a function?
A function is defined as a relation between the set of inputs having exactly one output each.
Linear functions are straight lines.
In the given option Graph A has the curve graph which can't be a linear function.
Graph B has a straight line which means it is a linear function.
Graph C the lines are not straight so it can't be a linear function.
Similarly, in Graph D, it can't be a linear function.
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