The same life day by day is like eating white rice every day for your brain(大脑). Playing games with your mind(头脑) keeps your brains quick, and make your memory and powers of reasoning much better. Try the following fun and free activities to stimulate your brain.

 Use the opposite hand: If you are right-handed, become a lefty. Changing the hand you usually use can get your brain thinking in a different way.

Talk to yourself: Pick one hour a day to discuss something with yourself. Describe what you see, what you are doing, or what you are going to do. Talking while thinking is a great brain booster(助推器).

 Write down your dream: You can write out your wishes and goals(目标) and they can call your attention. Keep a pen and paper next to your bed. You can record your sleeping dreams with them. It is a fun way to get your brain thinking. Along with increasing memory, trying to unlock the secret behind your sleeping brain is one way to get to know yourself better.

 Walk on: Just like the body, your brain needs exercise, too. Walking can increase blood circulation(血液循环), which encourages blood vessels(血管) in your brain grow, raise energy production and throw away the waste. So walk anywhere at anywhere at anytime if possible.

如图，直线 $y=\frac{2}{3}x+2$ 和x＝3的交点坐标是____．