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3 years ago

Solve for x, please

Mathematics

1 answer:

artcher [175]3 years ago

5 0

Answer:

x = 20

Step-by-step explanation:

4x + 20

60 + 20 = 80

80 ÷ 4 = 20

x = 20

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4x - 3y = -28<br>x + 5y = 39 cant seem to be able to figure the answer for this

Rus_ich [418]

value of x = -1 and value of y=8

Step-by-step explanation:

We need to solve the system of equations:

$4x - 3y = -28\,\,\,(1)\\x + 5y = 39\,\,\,(2)$

Multiply eq(2) with 4 and subtract with eq(1)

$4x-3y=-28\\4x+20y=156\\-\,\,\,-\,\,\,\,\,\,\,\,\,\,\,\,\,\,-\\--------\\-23y=-184\\y=\frac{-184}{-23}\\y=8$

So, value of y=8

Now, finding value of x by putting value of y in equation 2

$x+5y=39\\x+5(8)=39\\x+40=39\\x=39-40\\x=-1$

So, value of x = -1

value of x = -1 and value of y=8

Keywords: System of Equations

Learn more about System of Equations at:

#learnwithBrainly

4 0

3 years ago

Pete has 3 dollars less than what Linda has. If together has 81 dollars how much does each person have?

Makovka662 [10]

Answer:

Pete: 39, Linda: 42

Step-by-step explanation:

Suppose Pete has x dollars. If he has 3 dollars less than Linda, then Linda has 3+x dollars. Together, they have 81 dollars:

x+3+x=81

2x+3=81

2x=78

x=39

Since Pete has x dollars, and x=39, he has $39.

Linda has 3+x, which is 39+3 = $42

<em>I hope this helps! :)</em>

8 0

3 years ago

Square Root of 100 minus square root of 9

Alex17521 [72]

Answer:

Step-by-step explanation:

3 0

4 years ago

Read 2 more answers

What is 25/10 converting fractions to mixed numbers

mote1985 [20]

Hey!

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Solution:

~10 can go in to 25 two times.

10 + 10 = 20

25 - 20 = 5 (remainder)

~20 means that the whole number is 2.

2 5/10

~Simplify and Answer

2 1/2 or 2.5

-------------------------------------------------

Hope This Helped! Good Luck!

5 0

4 years ago

A Sixteen Foot ladder is leaning against a building. If the bottom of the ladder is sliding along the pavement directly away fro

Romashka [77]

Answer:

-0.69 feet per second

Step-by-step explanation:

We have dx/dt = 2 ft/sec, and we want to determine dy/dt.

x and y are related by the Pythagorean Theorem.

x²+y²=16²

Differentiate both sides of this equation with respect to t to get

$2x\frac{dx}{dt}+2y\frac{dy}{dt} =0$

$2y\frac{dy}{dt} =-2x\frac{dx}{dt}$

Divide both sides by 2y

$\frac{dy}{dt} =-\frac{x}{y}\frac{dx}{dt}$

When x = 5 ft, we have

x²+y²=16²

5²+y²=256

y²=256-25=231

therefore

y= $\sqrt{213}$

$\frac{dy}{dt} =-\frac{5}{\sqrt{213}}\frac{2 ft}{sec}$

=-0.69

The top of the ladder is sliding down (because of the negative sign in the result) at a rate of -0.69 feet per second.

5 0

3 years ago

Read 2 more answers