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3 years ago

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

Mathematics

2 answers:

Fed [463]3 years ago

8 0

8*.8=6.4
4x+6.4=40
40-6.4=33.6
33.6/4=x
8.4=x

Hope this helps :)

melisa1 [442]3 years ago

3 0

To solve this equation, first you must plug in the given y value.
This leaves you with:
4x + 8(0.8) = 40

Follow PEMDAS (parentheses, exponents, multiplication, division, addition, subtraction) to simplify the parenthesis.
After multiplying, you get:
4x + 6.4 = 40

Continue following PEMDAS to subtract 6.4 from both sides of the equal sign. Make sure to subtract on both sides so the equation remains even and balanced.
This leaves you with:
4x = 33.6

From here, isolate your variable, x, by dividing by four on both sides.
Leaving you with:
x = 8.4

So your final answer is x = 8.4 when y = 0.8

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Answer:

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To recover the investment James will take $\boxed{2.5{\text{ years}}}.$

Further Explanation:

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The current salary of James is $\$ 42000.$

The time taken to complete the college degree is $2{\text{ years}}.$

The cost of the college degree is $\$ 28000.$

The James’ new salary after college degree will be $\$ 56000.$

Calculation:

The total investment of James can be calculated as follows,

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The time taken by James to recover $\$ 140000.$

$\begin{aligned}{\text{Time}} &= \frac{{140000}}{{56000}}\\&= 2.5{\text{ years}}\\\end{aligned}$

To recover the investment James will take $\boxed{2.5{\text{ years}}}.$

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Answer details:

Grade: High School

Subject: Mathematics

Chapter: Investment and return

Keywords: James, job, current salary, salary, $42000, earn, college, college degree, 2 years, complete, graduation, cost, $28000, per year, investment, recover, new salary, work, able, school, full time.

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