Final answer:
If data for y = y(x) are linear then the plot of the data falls on a straight line.
Step-by-step explanation:
A linear equation is of the form y = a + bx, where a is the y-intercept and b is the slope. When this data is graphed, the result is a straight line. The graph of a linear equation is always a straight line, whether it slopes upward (if b > 0), is horizontal (if b = 0), or slopes downward (if b < 0).