yes It is relatively easy to determine whether an equation is a function by solving for y. When you are given an equation and a specific value for x, there should only be one corresponding y-value for that x-value. For example, y = x + 1 is a function because y will always be one greater than x.
If Jiri is x, Pamela is x -5, and tehri ages combined would be 35 so; x + x-5 = 35 collect the like terms 2x-5 = 35 add five to both sides 2x= 40 divide both sides by 2 x=20 Jiri's age is 20
