17+or minus the square root of 12÷34

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

!! 10 ! a westbound jet leaves central airport traveling 635 miles per hour. at the same time, an eastbound plane departs at 325 miles per hour. in how many hours will the planes be 1900 miles apart?

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0