Students helped rebuild a vacant house for a family in need. Sam helped put up 5 wall panels and 6 doorframes using 51 nails. Julie put up one wall panel and 4 doorframes using 27 nails. Both students used the same number of nails for each item they put up. How many nails are used to up a doorframe?

Solving Linear Systems by Substitution Learning Goal I can use the substitution method to solve linear systems of equations. Using x,y