What do two equivalent expressions always have in common?

Jackie purchased 3 bottles of water and 2 cups of coffee for the family for $7.35. ryan bought 4 bottles of water and 1 cup of coffee for his family for 7.15. how much does each bottle of water cost? how much does each cup of coffee cost?

25 ! the line of best fit is h = 5a + 86. predict the height at age 16.

Solve the system of equations y= 3/2 - 1, -x+ y =-3