When an equation of a line is in slope-intercept form (like this one) you are given information about how it will be graphed. Slope-intercept form is y = mx + b, where m is the slope and b is the y-intercept (where the line intersects the y-axis). The y-intercept here is 6, so look for a graph that intersects the y-axis (the vertical axis) at 6. It's either of the last two images you uploaded. Now we must look at the slope. The slope of y = x + 6 is 1, so the line will be slanted upward, rather than decline downward. The graph for y = x + 6 is the last image uploaded.
Hope this helps!
