What is the most simplified form of this You can zoom the picture:) also please don't put anything random I really need the help!

Asquare parking lot has 6,400 square meters what is the length in meters

Kapil needed to buy a long wooden beam. he went to two sawmills that each charge an initial fee plus an additional fee for each meter of wood. the following equation gives the price (in dollars) of a wooden beam from the first sawmill as a function of its length (in meters). p = 5+20xp=5+20x

3x + 4y = 5 x- 3y = -7 solve by substitution