Write an equation: monique had a collection of cars. she got 8 cars for her bday. she now has 25 cars. how many did she have in her collection before her bday? let c= number of cars.

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

Ineed with math stuff it involves graphs

Jorge wants to determine the enlarged dimensions of a digital photo to be used as wallpaper on his computer screen. the original photo was 800 pixels wide by 600 pixels high. the new photo will be 1,260 pixels wide. what will the new height be?