y varies directly with x, and y = 5 when x = 4. What is the value of x when y = 8
Mathematics · Middle School · Sun Jan 24 2021
Answered on
Given the statement:
y varies directly with x, and y = 5 when x = 4.
Determine the value of x when y = 8
Solution:
In order to determine the value of x, when y = 8, we must first find for the constant of variation. This can be done by multiplying the value of x and y.
k = xy
k = (5)(4)
k = 20
20 = 8x
Divide both sides by 8 in order to determine the value of x.
8x/8 = 20/8
x = 2.5
Final answer:
x = 2.5