Laura, Eric and deshaun sent a total of 97 messages during the weekend. Laura sent 7 more messages than deshaun

Answer 1

L+E+D = 97

L=7+D

7+D + E + D = 97

8D + E = 97

E = 97-8D

8D = 97-E

D = (97-E)/8

L=97-E-D

L= 97-(97-8D) -D = 8D-D = 7D

L=7D

7D +97-8D + D = 97

97=97

L=7D, E=97-8D, D = (1/8)(97-E) or L/7

E =97-8D = 97-8L/7, 7<L<97, 1<D<14, 1< E<85, D<E<L

Without further information all you can do is solve for one variable in terms of another