Question

suppose that z varies jointly with x and y. When x=2, y=2, z=7 write the equation that models the relationship

Answer 1

`\begin{gathered} z=\text{ x + y + b} \\ 7\text{ = 2+2+b} \\ 7\text{ = 4+b} \\ 7-4=b \\ b=\text{ 3} \\ z=\text{ x + y +3} \end{gathered}`