Evaluate -2x -8y when x-5, y=4

If the graphs of the linear equations in a system are parallel, what does that mean about the possible solution(s) of the system? a. there are infinitely many solutions. b. there is no solution. c. there is exactly one solution. d. the lines in a system cannot be parallel.

In the 30-60-90 triangle below side s has a length of and side r has a length

Somone me i want to know what 18 hours out of 24 hours in a fraction