All categories

3 years ago

3 math problem please show step by step

Mathematics

2 answers:

seraphim [82]3 years ago

7 0

Answer:

Step-by-step explanation:

7x+y=10

-7x-10y=26

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

-9y=36

y=36/-9

y=-4

7x+(-4)=10

7x-4=10

7x=10+4

7x=14

x=14/7

x=2

7(2)+y=10

14+y=10

y=10-14

y=-4

x=2, y=-4. (2, -4).

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

4x-2y=-14

3x-2y=-14

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

-(4x-2y)=-(-14)

3x-2y=-14

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

-4x+2y=14

3x-2y=-14

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

-x=0

x=0

4(0)-2y=-14

0-2y=-14

2y=0-(-14)

2y=0+14

2y=14

y=14/2

y=7

Answer: x=0, y=7. (0, 7).

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

6x+2y=20

-3x+3y=-30

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

6x+2y=20

2(-3x+3y)=2(-30)

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

6x+2y=20

-6x+6y=-60

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

8y=-40

y=-40/8

y=-5

6x+2(-5)=20

6x-10=20

6x=20+10

6x=30

x=30/6

x=5

Answer: x=5, y=-5. (5, -5).

Klio2033 [76]3 years ago

6 0

Answer:

See picture. Hope this helps!

You might be interested in

7/12 divided by 3/4 is what?

Kisachek [45]

28/36 will be your answer which can be simplified into 14/18 which can be simplified again to 7/9 and that's your final answer

7 0

4 years ago

Which statement is NOT true?

elena-s [515]

If x ^ 2 = 100, then x = 10.

For this case what you should know is the correct clearance of the following equation:
$x ^ 2 = 100
$
We then have two possible solutions:
$x=+/- \sqrt{100}$
Rewriting we have:
$x=+/-10$
Therefore, the solutions are:
$x1=10

x2=-10$
Answer:
A statement that is NOT true is:
If x^2 = 100, then x = 10.

3 0

3 years ago

The volume of a cylinder is 471 cm? If the

Elena L [17]

Answer:

Step-by-step explanation:

Formula for volume of a circle: V=πr²

If you multiply the circle by height, it becomes a cylinder.

Formula for volume of a cylinder: V=πr²h

Plug in the numbers and get r by itself:

471 = πr²(6)

Divide both sides by 6:

78.5 = πr²

Divide both sides by π:

25 = r²

Square root both sides:

$\sqrt{25}$ = $\sqrt{r} \\$ ²

5 = r

Radius is 5 cm

7 0

3 years ago

PLEASE HELP!!!!!!

kow [346]

A:93
B: slope

the slope is the rate of change of the line. this line models the distance between cop and the driver. note that the cop is standing still while the sports car is moving away at 93 mph

if the x-axis is in hours and the y-axis is in miles, then slope = rise/run = km/h, which is kilometers per hour. the slope is the rate of change of distance for the distance vs time graph

therefore the slope is 93 mph

7 0

3 years ago

A box contains 160 fruits. Of the total number of fruits in the box, 30% are apples. 25% of the remaining fruits in the box are

zzz [600]

Answer: 105 oranges.

Step-by-step explanation:

30% + 25% = 0.55 * 100 = 55

160 - 55 = 105

7 0

3 years ago