It's linear, so it's a line...
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Linear = Straight line! So, a graph of a linear relationship is a straight line.
a line
A straight line that goes through the origin.
A linear equation is a specific type of function that represents a straight line on a graph. While all linear equations are functions, not all functions are linear equations. Functions can take many forms, including non-linear ones that do not result in a straight line on a graph. Linear equations, on the other hand, follow a specific form (y = mx + b) where the x variable has a coefficient and the equation represents a straight line.
y intercept is when x is zero then you solve. slope is rise over run or y -y1 divided by x -x1 you graph by puting the y intersept on the y axis then you take the slope and do the rise then the run