Whats the algebraic expression of if three times a number is increased by 4, the result is -8

The pressure exerted on the walls of a container by a gas enclosed within it is directly proportional to the temperature of the gas. if the pressure is 6 pounds per square inch when the temperature is find the pressure exerted when the temperature of the gas is 380 degrees f show work for the

3x = 729 solve for x plz . it's urgent. will mark

What are the solutions for the following system? -2x^2+y=-5 y=-3x^2+5