Question

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

Answer 1

Answer:
`x=8.4`

Explanation:

You have the following equation:

`4x+8y=40`

In order to find the value of the variable "x" when
`y=0.8`, you need to substitute this value of "y" into the given equation and then you must solve for "x".

Applying this procedure, you get the following value of "x":

`4x+8y=40\\\\4x+8(0.8)=40\\\\4x+6.4=40\\\\4x=40-6.4\\\\x=(33.6)/(4)\\\\x=8.4`

Answer 2

The value of x is 8.4....

Explanation:

The given equation is:

4x+8y=40

where y = 0.8 = 8/10

Put the value of y in the given equation:

4x+8(0.8)=40

4x+6.4 = 40

Combine the like terms:

We get,

4x=40-6.4

4x= 33.6

Now divide both sides by 4

4x/4 = 33.6/4

x=8.4

Thus the value of x is 8.4....