Please help me, I have asked this question before but I need it again with all work included, Someone please HELP!

What is the solution to the system of the equations? x = y - 3 x + 3y = 13

How do businesses a country's economy? a. by investing in goods and services b. by increasing the unemployment rate c. by making profits

Apatient is to be given 35 milligrams of demerol every 4 hours. you have demerol 50 milligrams/milliliter in stock. how many milliliters should be given per dose?