Solving by substitution -3x-3y=3 and y=-5x-17

Inez has a phone card. the graph shows the number of minutes that remain on her phone card a certain number of days.

I'm confused on this could anyone me and show me what i need to do to solve it.

Carl is hanging pictures in his home. there is a space on a wall that has a width of 4 feet. carl has pictures with different widths. which picture width would fit in the space on the wall? a. 46 inches b. 60 inches c. 50 inches d. 54 inches