Answer:
y = 4x + 3
Step-by-step explanation:
Step 1: Write the general equation
y = mx + b
Step 2: Identify b, the Y intercept (x = 0)
b is the value of y when x = 0.
From the graph, when x = 0, y = 3.
Therefore, b = 3
Step 3: The second point from graph (x, y):
P = (1, 7)
Step 4: Define m as ratio of rise / run:
![m = \frac{y_2 - y_1}{x_2 - x_1}](https://tex.z-dn.net/?f=%20m%20%3D%20%5Cfrac%7By_2%20-%20y_1%7D%7Bx_2%20-%20x_1%7D%20)
Step 5: Put coordinates into ratio:
Using the two coordinates, (0, 3) and (1, 7), we would have,
![m = \frac{7 - 3}{1 - 0}](https://tex.z-dn.net/?f=%20m%20%3D%20%5Cfrac%7B7%20-%203%7D%7B1%20-%200%7D%20)
Step 6: Perform subtraction to get slope:
![m = \frac{4}{1}](https://tex.z-dn.net/?f=%20m%20%3D%20%5Cfrac%7B4%7D%7B1%7D%20)
m = 4
Step 7: Substitute values into y = mx + b:
Thus, plug in the values of m and b into the slope-intercept equation.
b = 3, m = 4, therefore:
y = (4)x + (3)
Step 8: Write answer:
y = 4x + 3