Identify the y-intercept, then find another point that lies on the grid.
y=1/2x+4
Practice makes perfect
Equations written in slope-intercept form follow a specific format.
y= mx+ b
In this form, m is the slope and b is the y-intercept. We need to identify these values using the graph.
y-intercept
The y-intercept is the y-value where the line crosses the y-axis.
We can see that the function intercepts the y-axis at (0, 4). This means that the value of b is 4.
y= mx+ 4
Slope
To find the slope, we will trace along the line on the given graph until we find a lattice point. In doing so, we can identify the slope m using the rise and run of the graph.
Here we've identified (2,5) as our other point. Traveling to this point from the y-intercept requires that we move 2 steps horizontally in the positive direction and 1 step vertically in the positive direction.
rise/run=1/2 ⇔ m = 1/2
Writing the Equation
Now that we have the slope and the y-intercept, we can form our final equation.
y= 1/2x+ 4
