Find the slope and y intercept

Yuri, sam and dani had the same math homework last night, but none of them finished it. yuri finished 3/8 of her homework, sam finished 4/6 of her homework and dani finished 1/2. who finished the most math homework? who finished the least amount?

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?

Determine the area of a triangle with (see picture below)