Question

given z varies jointly as x and y , use the given values to find an equation that relates to x, y, and z. x=12, y=5, and z=30

Answer 1

If z varies jointly as x and y, that implies

z = kxy for constant k

Plug in the x, y, and z values and solve for k

From there, go back to z = kxy and plug in that k value, leaving the other variables alone, to get the equation