An equation between two variables which gives a straight line when plotted on a graph

answer:

linear equations with two variables may appear in the form ax + by = c, and the resulting graph is always a straight line. more often, the equation takes the form y = mx + b, where m is the slope of the line of the corresponding graph and b is its y-intercept, the point at which the line meets the y-axis.

step-by-step explanation:

b.an increase in a causes b to decrease

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