The school has a rectangular playground. The ratio of the length of the playground to its width is 3 : 4. The length of the playground is 45 yards. Find the
perimeter and area.

Step 1) Pick two points on the line

Point 1: (0,-1)

Point 2: (-2,1)

Step 2) Use those points to find the slope

m = (1 - -1) / (-2 - 0)

m = (1 + 1) / -2)

m = 2 / -2

m = -1

Step 3) Plug in the slope and one point on the line into the slope-intercept form equation and solve for b, the y-intercept

y = -1x + b

-1 = -1(0) + b

b = -1

Step 4) Plug in the slope and the y-intercept into the slope-intercept form equation to get the final equation of the line

y = -1x - 1

Hope this helps! :)