Question

How to write a equation from a graph

Answer 1

Answer/Step-by-step explanation:

So, if there is line on the graph and we need to get its equation in slope-intercept for (y = mx+b where m is the slope and b is the y-intercept). First, we have to take two points that lie on that line. Then, we will use the slope formula (m = y2 - y1 / x2 - x1). Once we get the slope, we have to find the y-intercept aka the b - value in the equation. So, to find this we have to take one of the coordinate point (that lies on the graph and was used to find the slope) and the slope. When you get the b - value, you have to substitute that value and the slope value into the equation. This is how you can write an equation from a graph.

Ex. (2, 3), (4, 9)

m = 9 - 3 / 4 - 2

m = 6/2

m = 3        <--- This is the m value aka the slope

y = mx + b         (In this case, we will use the first point which is (2,3)).

3 = 3(2) + b

3 = 6 + b

b = -3

y = 3x -3

Hope this helps!

Answer 2

Answer:

The bottom numbers comes first and then the side

Step-by-step explanation:

If i had a graph and i was using gallons per hour i would put gallons on the bottom and hours on the side