When you are at a Chinese airport, you want to find the restroom. How do say " where is the restroom?" in Chinese?
私は学校（）勉強しています。 A.で B.を C.は Dが
A is correct.
Find an equation of the line which passes through the point (4,-7) and has slope 3
Using the Point-Slope Form, we obtain the equation y-(-7)=3 (x-4) or, simplifying, y+7=3 (x-4) or y=3x-19