A carpenter wants to cut two boards to fit snugly together. The carpenter's squares are aligned segment EF, as shown. Is segment AB and segment CD parallel? Explain please

To solve this problem you must identify the slope and the y-intercept and determine if they are positive or negative.

To find the slope, find two direct points on the graph and find rise over run.
This comes out to:
2/1
Since the line is pointing downward, the slope is negative.
This allows you to rule out answer choices B and C, as their slope values are positive.

Next, to find the y-intercept, you must predict, based on what is seen on the graph, where he line crosses the y-axis.
It can be assumed that the line crosses at a positive 6.
This makes your y-intercept a:
6

The answer choice that lines these up is A. y = -2x + 6