Can someone help? it’s 7th grade math and im finishing this project for the end of the year

Find the equation of the line that goes through the points (4, –1) and (2, –5). use slope formula,equation,to find the slope of a line that passes through the points. m = use slope-intercept form, y = mx + b, to find the y-intercept (b) of the line. b = write the equation in slope-intercept form, y = mx + b.

Having a hard time understanding this question (see attachment).

What is the 17th term in the arithmetic sequence in which a6 is 101 and a9 is 83