How to solve y = 8x - 9

In the figure shown below, m < 40 and ab =8. which equation could be used to find x?

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?

Ineed to know the ordered pairs for this equation i need the answer quick because it’s a timed test