What is the value of x in the equation 4x + 8y = 40, when y = 0.8?

Solution:

Given equation 4x + 8y = 40 and y = 0.8

Let us solve the equation

Substitute y = 0.8 in the given equation

 We get, 4x + 8y =40 ⇒ 4x + 8(0.8) =40

⇒ 4x + 6.4 =40

⇒ 4x = 40 - 6.4

⇒ 4x = 33.6

⇒ x = 33.6/4

⇒ x = 8.4

What is the value of x in the equation 4x + 8y = 40, when y = 0.8?

Summary:

The value of x in the equation 4x + 8y = 40, when y = 0.8 is 8.4.