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3 years ago

X+y=27 x-y=1 What is x? What is y?

Mathematics

2 answers:

Zina [86]3 years ago

8 0

Answer:

x= 14 y= 13

Step-by-step explanation:

Use substitution or elimination

Art [367]3 years ago

7 0

Answer:

Y= 13 X= 14

Step-by-step explanation:

X-Y=1 (add Y on both sides to cancel it out)

X=1+Y (now we pug in this for the next equation)

X+Y=27 is now (1+Y)+Y=27

1+Y+Y=27 (Combine like terms)

1+2Y=27 (Subtract 1 on both sides to cancel it out)

2Y=26 (Divide by 2 on both sides to cancel it out)

Y=13 (Now we plug it into the another equation)

X + Y = 27 is now X + 13 = 27

X+13=27 (subtract 13 on both sides)

X=14

ALWAYS CHECK YOUR ANSWER BY PLUGGING IT IN!!!

X-Y=1 is 14-13=1 Which is correct!!

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1.2 x 10^19 x 5.88 x 10^12

Lapatulllka [165]

9514 1404 393

Answer:

7.056 × 10^31

Step-by-step explanation:

The applicable rule of exponents is ...

(10^a)(10^b) = 10^(a+b)

$(1.2\times10^{19})\times(5.88\times10^{12})=(1.2\cdot5.88)\times10^{19+12}\\\\=\boxed{7.056\times10^{31}}$

As you know, the commutative and associative properties of multiplication let you rearrange the order of the product to any convenient form. Here it is convenient to group the mantissas together and the powers of 10 together.

Additional comments

This is a product your scientific or graphing calculator can produce for you. Likely it will display the result in scientific notation because it won't have enough display digits to show you the product any other way. For smaller numbers, you can set the display mode to give you scientific notation.

If you choose to use a spreadsheet to perform this calculation, the numbers would be entered as 1.2e19 and 5.88e12. The result will be something like 7.056e31. You may have to format the display to show 3 decimal places.

7 0

2 years ago

Please explain how to do it because im very confused please and thank you!!!!!!!

mezya [45]

Answer:

108°

Step-by-step explanation:

Formula :

Degree Measure = Arc length / radius x 180/π

Solving :

Degree Measure = 3π/5 x 180/π

Degree Measure = 3 x 36

Degree Measure = 108°

4 0

2 years ago

Read 2 more answers

Johnny measured the wading pool at the Belleville Community Center and calculated that it has a circumference of 6.28 meters. Wh

Degger [83]

Answer:

your mom

Step-by-step explanation:

im on top she is on the bottom <3

6 0

2 years ago

Jamal's deck is in the shape of a polygon and is shown on the grid below.(-8,6)(6,6)o[(-8, -4),(6,-4)What is the area of Jamal's

PSYCHO15rus [73]

Let;

A(-8,6) B(6,6) C(6, -4) D(-8, -4)

Let's find the length AB

x₁= -8 y₁=6 x₂=6 y₂=6

We will use the distance formula;

$d=\sqrt[]{(x_2-x_1)^2+(y_2-y_1)^2}$

$=\sqrt[]{(6+8)^2+(6-6)^2}$ $=\sqrt[]{14^2+0}$ $=14$

Next, we will find the width BC

B(6,6) C(6, -4)

x₁= 6 y₁=6 x₂=6 y₂=-4

substitute into the distance formula;

$d=\sqrt[]{(6-6)^2+(-4-6)^2}$

$=\sqrt[]{(-10)^2}$ $=\sqrt[]{100}$ $=10$

Area = l x w

= 14 x 10

= 140 square units

7 0

1 year ago

find the x intercept of the graph of the equation y equals -2.65 x + 25. what does the x intercept mean in terms of the situatio

natali 33 [55]

Ok so we can see for every 2 cups of medium coffee, the balance goes down 5.30$. So that means that for every coffee, her balance goes down 2.65$. Solving for the x-intercept means how many medium coffees can I get until my balance is 0. First, we have to find the y-int so it's easy. The slope is -2.65 because for every medium coffee, her balance goes down 2.65$. So we have y=-2.65x+b. Plugging in any point, I choose (4,14.40), we get 14.4 = -2.65 × 4 +b. Solving for b we get 25 for the y intercept, meaning the equation is y = -2.65x + 25 . To find the x intercept, we set y=0. So we have 0 = -2.65x+25. Solving for x we get approx. 9.4. We can't have decimals so we round down to 9. So the x int is ≈ 9.4 meaning we can only buy 9 coffee and have a little extra. But, if the problem said how many more coffees can she get, then here is how we do it. Since she already got 4 coffees, and the max is 9, we do 9-4 and we get 5, so she can buy 5 coffeed more.

3 0

3 years ago