Show me how to solve Y=-2/7x+5

Find the solution of this system of equation -7x+y=-20 9x-3y=36

If t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.

Atest consists of 10 multiple choice questions, each with 5 possible answers, one of which is correct. to pass the test a student must get 60% or better on the test. if a student randomly guesses, what is the probability that the student will pass the test?