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3 years ago

Choose the system of equations that matches the following graph:

Mathematics

2 answers:

grin007 [14]3 years ago

8 0

We see that (-7,4) is the intersection
therefor x=-7 and y=4 must be true for those 2 equations

another way
the slopes must be negative then positive
not A nor D
test x=-7 and y=4
B works

B is answer

vladimir1956 [14]3 years ago

3 0

Answer:

Option B.

3x + 7y = 7

5x − 7y = −63

Step-by-step explanation:

Given : Graph of two equations.

To find : Choose the system of equations that matches the following graph?

Solution :

First we examine the graph in which both the lines intersect at one point i.e, (-7,4)

So, from the following equation when both the equation satisfying the point is the required equations.

3x + 7y = 7 5x + 7y = −63

3(-7)+7(4) = 7 5(-7) + 7(4) = −63

-21 + 28 = 7 -35+28 = −63

7 = 7 -7 ≠ −63

This equation is not true.

3x + 7y = 7 5x - 7y = -63

3(-7)+7(4) = 7 5(-7) - 7(4) = -63

-21 + 28 = 7 -35-28 = -63

7 = 7 -63= -63

This equation is true.

3x - 7y = 7 5x + 7y = -63

3(-7)-7(4) = 7 5(-7) + 7(4) = -63

-21 - 28 = 7 -35+28 = -63

-49 ≠ 7 -7 ≠ -63

This equation is not true.

3x - 7y = 7 5x - 7y = -63

3(-7)-7(4) = 7 5(-7) - 7(4) = -63

-21 - 28 = 7 -35-28 = -63

-49 ≠ 7 -63 = -63

This equation is not true.

Only equation B satisfy the intersection point.

Therefore,Option B is correct.

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What is the value of y in the equation 5x+2y=20 when x=0.3

MakcuM [25]

5 multiplied by .3 is 1.5
1.5 + 18.5 = 20.
y = 9.25

3 0

3 years ago

Someone just answer this math question thingie lol. you’ll get 33 points G

Stels [109]

1) $(-2x+4)+(x-6)$ is simplified into $=-x-2$

2) $(uv-3)+(4uv+1)$ is simplified into $5uv-2\\$

3) $(11x-8)-(2x+3)$ is simplified into $-9x-11$

4) $(x^2-4)-(x-2)$ is simplified into $x^2-x-2$

5) $(12-3t-7t^2)+(1+3t-t^2)$ is simplified into $-8t^2+13$

Step-by-step explanation:

We need to solve the polynomials.

1) $(-2x+4)+(x-6)$

Solving:

$(-2x+4)+(x-6)\\=-2x+4+x-6\\Combining\,\,like\,\,terms:\\=-2x+x+4-6\\=-x-2$

So, $(-2x+4)+(x-6)$ is simplified into $=-x-2$

2) $(uv-3)+(4uv+1)$

Solving:

$(uv-3)+(4uv+1)$

Expanding:

$=uv-3+4uv+1\\Combining\,\,like\,\,terms:\\=uv+4uv-3+1\\=5uv-2\\$

So, $(uv-3)+(4uv+1)$ is simplified into $5uv-2\\$

3) $(11x-8)-(2x+3)$

Solving:

$(11x-8)-(2x+3)$

Expanding:

$=11x-8-2x-3\\Combining\,\,like\,\,terms:\,\,\\=11x-2x-8-3\\=-9x-11$

So, $(11x-8)-(2x+3)$ is simplified into $-9x-11$

4) $(x^2-4)-(x-2)$

Solving:

$(x^2-4)-(x-2)$

Expanding:

$=x^2-4-x+2\\Combining\,\,like\,\,terms:\\=x^2-x-4+2\\=x^2-x-2$

SO, $(x^2-4)-(x-2)$ is simplified into $x^2-x-2$

5) $(12-3t-7t^2)+(1+3t-t^2)$

Solving:

$(12-3t-7t^2)+(1+3t-t^2)$

Expanding:

$=12-3t-7t^2+1+3t-t^2\\Combining\,\,like\,\,terms:\\=12+1-3t+3t-7t^2-t^2\\=13+0t-8t^2\\=-8t^2+13$

So, $(12-3t-7t^2)+(1+3t-t^2)$ is simplified into $-8t^2+13$

Keywords: Solving Polynomials

Learn more about solving Polynomials at:

#learnwithBrainly

5 0

3 years ago

Read 2 more answers

Simplify.<br> (WILL GIVE BRAINLIEST)

Novosadov [1.4K]

Answer:

$\frac{\sqrt{x} }{2x}$

Step-by-step explanation:

Rationalize the denominator first (keep in mind we are NOT solving this because there is no equals sign here. We are merely simplifying.)

$\frac{\sqrt{5x} }{x\sqrt{20} } *\frac{\sqrt{20} }{\sqrt{20} } =\frac{\sqrt{100x} }{20x}$

Now simplify by taking the square root of 100 to get:

$\frac{10\sqrt{x} }{20x}$

Divide numerator and denomiator by 10 to get:

$\frac{\sqrt{x} }{2x}$

4 0

3 years ago

Please help really Urgent

luda_lava [24]

The answer is 18because you multiply by 3

8 0

3 years ago

Quick, please!<br><br><br> If 2 answers will vote brainliest!

tatyana61 [14]

Answer:

Hello again! x = 85

Step-by-step explanation:

Because triangles are 180 degrees and

68 + 27 = 95 and 180 - 95 = 85 so our missing angle is 85 hope this helps!

3 0

3 years ago