4 x plus 8 y equals 40, when y equals 0.8?

Mathematics

1 answer:

kondor19780726 [428]3 years ago

3 0

Answer:

When x = 8.4 and y = .8 then 4x + 8y = 40

Step-by-step explanation:

4x + 8y = 40

y = .8

Let's solve for x by substituting .8 for y (since y is given)

4x + 8(.8) = 40

4x + 6.4 = 40 Subtract 6.4 from both sides.

4x + 6.4 - 6.4 = 40 - 6.4

4x = 33.6 Divide each side by 4

4x/4 = 33.6/4 4 cancels on the left because 4/4 = 1

x = 33.6/4

x = 8.4

So when x = 8.4 and y = .8 then 4x + 8y = 40

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