To draw the line for the equation \(y = 8x + 12\) on a graph, follow these steps:
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Start with the y-intercept: Find the point where the line crosses the y-axis. For this equation, when \(x = 0\), \(y = 12\). So, plot the point (0, 12) on the graph.
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Use the slope: The number 8 in the equation is the slope. This means that for every 1 hour (1 unit increase in \(x\)), the cost (\(y\)) goes up by 8. From the point (0, 12), move 1 unit right (to 1 on the x-axis) and 8 units up (to 20 on the y-axis). Plot this second point at (1, 20).
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Draw the line: Now that you have at least two points, connect them with a straight line.
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Extend the line: Make sure the line goes through both points and extends in both directions.
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Label the axes: Don’t forget to label the x-axis as "Hours" and the y-axis as "Total Cost".
Now you have a graph that shows the cost of surf lessons based on the number of hours!