Final answer:
To find the equation of a line using a given graph, determine the slope and y-intercept. Use two points on the line to find the slope and substitute it along with a point into the equation y = mx + b to find the y-intercept.
Step-by-step explanation:
The equation of a straight line can be written in the form y = mx + b, where m represents the slope of the line and b represents the y-intercept. To find the equation of the line using a given graph, you need to first determine the values of the slope and y-intercept.
One way to find the slope is by selecting any two points on the line. Then, you calculate the change in the y-values divided by the change in the x-values to determine the slope. Once you have the slope, you can substitute it along with a point on the line into the equation y = mx + b to find the value of b, which represents the y-intercept.
For example, if the slope is -1.4946 and the y-intercept is 193.88, the equation of the line would be y = -1.4946x + 193.88.