Slope Intercept Form
The slope-intercept form of a linear equation is written as y = mx + b, where m represents the slope of the line and b represents the y-intercept, which is the point where the line crosses the y-axis
The slope-intercept form of a linear equation is written as y = mx + b, where m represents the slope of the line and b represents the y-intercept, which is the point where the line crosses the y-axis.
Here is how you can use the slope-intercept form to graph a linear equation:
1. Identify the slope (m): The slope represents the rate of change of the line. It determines how steep or flat the line is. It can be a positive or negative number or even zero. You can determine the slope by calculating the change in y divided by the change in x between any two points on the line.
2. Identify the y-intercept (b): The y-intercept is the value of y when x is zero, and it determines where the line crosses the y-axis.
3. Plot the y-intercept: Plot the point (0, b) on the graph, which corresponds to the y-intercept.
4. Use the slope to find additional points: To get more points on the line, use the slope. If the slope is a fraction, you can take one step up and/or down and one step to the right, or divide the y-change by the x-change to find the fraction. For instance, if the slope is 2/3, you can go up two units and right three units from the y-intercept, then plot that point. Repeat this process to find more points if needed.
5. Connect the points: Once you have two or more points, draw a straight line through them to graph the linear equation.
Example:
Let’s say we have a linear equation in slope-intercept form: y = 2x + 3.
We see that the slope (m) is 2, and the y-intercept (b) is 3. So, we start by plotting the point (0, 3) on the graph.
Then, since the slope is 2, we can go up two units and right one unit from the y-intercept. This gives us the point (1, 5).
We can also go down two units and left one unit from the y-intercept to get the point (-1, 1).
Now, we connect the two points on the graph with a straight line, which represents the equation y = 2x + 3.
Remember, the slope-intercept form of a linear equation is a helpful tool for graphing lines since it provides information about both the slope and the y-intercept.
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