Question

which graph is linear? graph b graph c graph d graph a

Explanation:

Step1: Recall the definition of a linear graph

A linear graph represents a linear function, which has the form \( y = mx + b \) (where \( m \) is the slope and \( b \) is the y - intercept) and its graph is a straight line. Also, a linear graph can be a vertical line (of the form \( x = c \), where \( c \) is a constant) or a horizontal line (of the form \( y = k \), where \( k \) is a constant), as these are also linear (vertical lines have an undefined slope, horizontal lines have a slope of 0). From the visible part of the graphs, we need to identify which one is a straight line.

Step2: Analyze the given graphs

Looking at the graphs (even with the partial view), a linear graph should be a straight line. If one of the graphs (for example, if Graph A or another has a straight - line appearance, but from the options and the context, we assume that the correct linear graph is identified as follows. Let's assume that among the graphs, the one with a straight - line (either vertical, horizontal, or with a constant slope) is the linear one. If we consider the standard, a linear graph's plot of points should lie on a straight line.

Answer:

(Assuming the correct linear graph is, for example, if Graph A is a straight line, then) Graph A (or the appropriate graph based on the actual visual which shows a straight line, as linear graphs are straight - line representations of linear functions \( y=mx + b \), \( x = c \), or \( y=k \)).