A+B=15 —>A+15=B(plug this into the other equation) 60a+30b=600 60a+30(a+15)=600 60a+30a+150=600 90a+150=600 90a=450 A=5 (plug back in to first equation) A+B=15 5+B=15 B=10
The formula for area is base times height, or height x width So if the window is 16 inches wide then 336 divided by 16 equals the height 336 divided by 16 is 21. Check 21 x 16 = 336 336 = 336 :)