if 7 out of 10 doctors prefer cough up syrup, then that means 4200 is 7/10ths of the doctors divide 4200 by 7 to get 600 then, multiply 600 by 10 to get 6000, the total number of doctors
Move the 3x over to the side with the 3 so it will become a -3x now you have 4y=-3x+3 now you have to remove the 4 from the y so now you have y=-3/4x+3/4 so you slope will be -3/4
