Write a let statement, an equation, solve: Jeremy is 14 years old. This is 4 1/2 years more than half his sisters age. How old is his sister

J = 14

J = 1/2S + 4 1/2

14 = 1/2S + 9/2 ... multiply everything by 2 to get rid of fractions

28 = S + 9

28 - 9 = S

19 = S

check ...

14 = 1/2S + 9/2 ... S = 19

14 = 1/2 (19) + 9/2

14 = 9 1/2 + 9/2

14 = 19/2 + 9/2

14 = 28/2

14 = 14 (correct)

so the sister is 19 <===