4$-20%
X$-100%
X=4·100:20=400:20=20
Answer : He paid for the meal 20$.
Answer: x= 2/3 - 1/3y
Explanation step by step:
Step 1: Move variable to the right hand side and change its sign.
3x = 2-y
Step 2: divide both sides of the equation by 3.
x= 2/3 - 1/3y