Question

suppose y varies jointly as x and z. Find y when when x =-4 and z=25, if y=206 when x=-6 and z=-11. Round your answer to the nearest hundredth , if necessary.

Answer 1

Y = kxz
Find k first to get the equation.
206 = k*(6*11)
206 = 66*k
Divide both sides by 66.
3.12 = k

y = 3.12xz
y = 3.12(-4*25)
y = 3.12(-100)
y = -312