In this question, the trail is 2940 miles long and Manfred is already hiking the 3/7 of the trail. You are asked how many miles he has a hike. Then to find it you just need to multiply the trail length with the ratio of hike/total trail. The calculation would be:
The line x - y = 5 passes through points (-5,0) and (0,5) the line in slope intercept form is y = x + 5 and plug in the point to see if the equation is true.
