Please solve 3 and 4

3 Directions: Solve the system of linear equations by graphing. A candidate for City Council is ordering yard signs and banners for his campaign. For her first order, she got 8 signs and 4 banners for $72. For her second order, she got 15 signs and 12 banners for $180. How much do each of the signs and banners cost? 10 12 14 16 18 20 _/4 points 4 Use the substitution method to solve the system of equations Students helped rebuild a vacant house for a family in need. Abby used 112 nails on 7 cabinets and 7 windows. Max put together 3 cabinets and 1 window using 36 nails. Both students used the same number of nails for each item they put up. How many nails are used to up a window? _/3 points