SOLUTION: We don't use any type of algebra textbooks in my algebra 1 class so how do i write an equation based on the graph?

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Question 172454: We don't use any type of algebra textbooks in my algebra 1 class so how do i write an equation based on the graph?
Answer by actuary(112) About Me  (Show Source):
You can put this solution on YOUR website!
For purposes of my response to your question, I am ssuming that the graph is a straight line. The standard form for the equation of a straight line is
y = m*x + b where m is the slope of the line and b is the y-intercept.
To calculate the slope of the line, select two from from the graph of the line. The points should be in ordered pair form i.e. {x1,y1}. The slope "m" is calculated from the two pairs of points that you have selected.
m = (y1 - y1)/(x2-x1)
The y-intercept "B" is determined from the from the graph by selecting the value for "y" when x = 0.
+graph%28+200%2C+200%2C+-10%2C+10%2C+-10%2C+10%2C+2x-5+%29+
In this case, the slope is 2 and the y intercept is -5