To graph a line with the equation \( y = mx + b \), follow these simple steps:
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Identify the Slope (m): This is the number in front of \( x \). It shows how steep the line is and the direction it goes. A positive slope means the line goes up from left to right, and a negative slope means it goes down.
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Identify the Y-Intercept (b): This is the constant term. It tells you where the line crosses the y-axis (when \( x = 0 \)).
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Plot the Y-Intercept: Start by marking the point on the graph where \( y = b \) (the y value when \( x = 0 \)).
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Use the Slope to Find Another Point: From the y-intercept, use the slope to find a second point. For example, if the slope is \( \frac{2}{1} \), move up 2 units and right 1 unit from the y-intercept.
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Draw the Line: Connect the two points with a straight line, extending it in both directions.
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Label the Line: Optionally, label the line with its equation for clarity.
That's it! You now have a graph of the line represented by the equation \( y = mx + b \).