Question

Look at the graph shown:

Answer 1

Slope-intercept form: y = mx + b, where m is the slope and b is the y-intercept.

The graph intersects the y-axis at (0, -1), therefore I immediately know that the answer is either option B or D (they are the only ones with -1 as b).
To find slope:

(1, 2), (0, -1)

2 - (-1) / 1 - 0  -->   2 + 1 / 1  -->  3/1 = 3

Answer:
B. y = 3x - 1

Hope this helps.