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

2 Answers

5 votes

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

User Nikketa
by
7.6k points
4 votes

Answer:

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....

User Cantonic
by
8.2k points

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