All categories

4 years ago

2x+8y=6, -5x-20y=-15need work because I don't understand

Mathematics

1 answer:

Vlada [557]4 years ago

4 0

Answer:

Infinitely many solutions.

Step-by-step explanation:

Step: Solve 2x + 8y = 6 for x:

2x + 8y = 6

2x + 8y + −8y =6 + −8y (Add -8y to both sides)

2x = −8y + 6

2x/2 = (-8y + 6)/2 (Divide both sides by 2)

x = −4y + 3

Step: Substitute −4y + 3 for x in −5x − 20y = −15:

−5x − 20y = −15

−5 (−4y + 3 ) −20y = −15

−15 = −15 (Simplify both sides of the equation)

−15 + 15 = −15 + 15 (Add 15 to both sides)

0 = 0

You might be interested in

Write the word sentence as an inequality. A number z is fewer than 3/4.

sdas [7]

Answer:

$z$

Step-by-step explanation:

5 0

3 years ago

1. Which are true of x = log10 31,500? Select all that apply.

ziro4ka [17]

Given:

$x=\log_{10}31,500$

To find:

Select the true statements from the given options about the given value.

Solution:

We have,

$x=\log_{10}31,500$

It can be written as

$x=\log_{10}(2^23^25^37)$

$x=\log_{10}(2^2)+\log_{10}(3^2)+\log_{10}(5^3)+\log_{10}(7)$ $[\because \log(ab)=\log a+\log b]$

$x=2\log_{10}2+2\log_{10}3+3\log_{10}5+\log_{10}(7)$

$x=2\left(0.30105\right)+2\left(0.47712\right)+3\left(0.69897\right)+0.8451$

$x=4.49835$

Clearly, the value of x lies between 4 and 5. So, $x>4$ and $x$ .

Therefore, the correct options are C and D.

4 0

3 years ago

A quart of stain covers 100 square feet. How many quarts should you buy to stain the wheelchair ramp? (Assume you do not have to

mina [271]

This shows that the number of quarts she should you buy to stain the wheelchair ramp is 9 quart

<h3>Surface area of a pyramid</h3>

This the sum of all the area of the surfaces. The given figures is made of 3 rectangles and 2 triangles

<u>Determine the surface area</u>

TSA = (25*25) + (2 * 5*301/12) + (5*2.08333)

TSa = 625 + 258.33333 + 10.41665

TSA = 893.74995

If a quart of stain covers 100 square feet, the total nuber to buy is given as:

Number to buy = 894/100 = 8.94

This shows that the number of quarts she should you buy to stain the wheelchair ramp is 9 quart

Learn more on surface area here: brainly.com/question/1297098

#SPJ1

3 0

2 years ago

(a) What is the equation of the line, written in slope-intercept form? Show how you determined the

lutik1710 [3]

Answer:

Step-by-step explanation:

6 0

4 years ago

Which of the following has a graph that is wider than the graph of y=3x2+2 ? a.y=3x2+3 b.y=0.5x2+1 c.y=4x2 +1 d.y=4x2+1

Goryan [66]

So sorry fir it being this late but the answer is B

5 0

3 years ago

Read 2 more answers