Write an equation to find the value of so that ench pair of polygons has the same perimeter. Then solve.

x+6
x+9
x+3

x+4
x+1

5x
5x
5x
5x
5x
5x

x+14
x+17
8x+9

The students at jefferson middle school are raising money for a charity by selling t-shirts and hats. the number of t-shirts sold was 3 times the number of hats. the profit was $5 for each t-shirt sold and $2.50 for each hat sold. the students raised $840 for the charity. they used the system below to analyze their success and found the solution to be (144, 48). 5x+2.50y=840 x=3y how much did they earn from t-shirt sales?