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Lina20 [59]
4 years ago
8

Which statements are true the ordered pair (1, 2) and the system of equations?

Mathematics
1 answer:
GuDViN [60]4 years ago
4 0
This is just a matter of subbing (1,2) into ur equations to see if they make the equations true

(1,2)...x = 1 and y = 2

y = -2x + 4                          7x - 2y = 3
2 = -2(1) + 4                       7(1) - 2(2) = 3
2 = -2 + 4                            7 - 4 = 3
2 = 2 (correct)                     3 = 3 (correct)

when (1,2) is subbed into the first equation, the equation is true
when (1,2) is subbed into the 2nd equation, the equation is true
the ordered pair (1,2) is a solution to the system of equations...and it is a solution to the system because it satisfies both equations...if it would have only satisfied one of them, it would not be a solution to the system of equations


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What is the measure of x? <br> A. 36°<br> B. 72°<br> C. 144°<br> D. 360°
lutik1710 [3]
This angle will be smaller than 108*. So when we know it will be multiplied by 2 C and D are automaticly marked off.

A or B.  36 times 2 = 72  72 times 2 = 144.

If we look at the angles they are less than 90* so our answer would be A. 36*.

Hoped I helped!

7 0
4 years ago
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A cone has a circular base of radius 12cm and a height of 30cm .Find the volume of cone. What is the answer:4250 4225 4552 4520
Natalka [10]

Answer:

4520

Step-by-step explanation:

v= pi^2r times h/3

3.14 times 144

452.16 times 10

which is 4521.6

this is closest to 4520

hope this helps

3 0
3 years ago
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What is -20 and 3/4 as a decimal.
REY [17]

Answer:

20.75

Explanation:

20+3/4

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6 0
3 years ago
Explain, in writing, the steps in graphing and finding the solution to the system of equations.
Anna11 [10]

Answer:

Feel free to copy and paste:

Use the slope-intercept form to find the slope and y-intercept. To do this, use y=mx+b. Plug the variables where m=1 and b=2. Slope of the line is m and y-intercept is value of b, so the slope is 1 while the y-intercept is (0,2). Any line can be graphed using two points, and using two x values to plug them into the equation to find the corresponding y values: 0=x+2 is (-2,0). Y-intercept is already known, so use the known values and make a table where x= -2,0 and y = 0,2. Now, graph the line using the slope, y-intercept, and known points (-2,0), (0,-2) to plot the graph. Coincidingly, the answer to solve your system of equations will be the x-intercept: (-2,0).

4 0
3 years ago
find the surface area of a right regular hexagonal pyramid with sides 3 cm and slant heights 6cm. show all of your work.​
DedPeter [7]

Answer:

The surface area of right regular hexagonal pyramid = 82.222 cm³

Step-by-step explanation:

Given as , for regular hexagonal pyramid :

The of base side = 3 cm

The slant heights = 6 cm

Now ,

The surface area of right regular hexagonal pyramid = \frac{3\sqrt{3}}{2}\times a^{2} + 3 a \sqrt{h^{2}+ 3\times \frac{a^{2}}{4}}

Where a is the base side

And h is the slant height

So, The surface area of right regular hexagonal pyramid = \frac{3\sqrt{3}}{2}\times 3^{2} + 3 \times 3 \sqrt{6^{2}+ 3\times \frac{3^{2}}{4}}

Or, The surface area of right regular hexagonal pyramid = \frac{3\sqrt{3}}{2}\times 9 + 9 \sqrt{36+ 3\times \frac{9}{4}}

Or,  The surface area of right regular hexagonal pyramid = 23.38 + 9 × \frac{171}{4}

∴  The surface area of right regular hexagonal pyramid = 23.38 + 9 × 6.538

I.e The surface area of right regular hexagonal pyramid = 23.38 + 58.842

So,  The surface area of right regular hexagonal pyramid = 82.222 cm³ Answer

6 0
4 years ago
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