Question

Z varies jointly with x, and y, and z=7 when x= 2, y= 2
pleasee I need an answer now!!

Answer 1

z = 1.75xy

Explanation:

Given z varies jointly as x and y then the equation relating them is

z = kxy ← k is the constant of variation

To find k use the condition z = 7 when x = 2 and y = 2, then

7 = k × 2 × 2 = 4k ( divide both sides by 4 )

1.75 = k

z = 1.75xy ← equation of variation

Answer 2

(7/4)(2)(2)=7

Explanation: