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3 years ago

Helppppp pleaseeee c: for brainliest

Mathematics

1 answer:

Alina [70]3 years ago

4 0

Answer:

I have no idea how to answer this... :P

Sorry, I am quite a dummy.

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What is the x-coordinate of the solution of the following system of equations?

Varvara68 [4.7K]

The easiest way to solve this is by elimination.

3x - y = 6

6x + y = 21

Since you have a negative and positive y with the same coefficients (1), they cancel, and you add the other terms so it would look like:

9x = 27

Then solving for x leaves you with x = 3

Then you take the x value of three and plug it into to either of the equations, so

3(3) - y = 6

9 - y = 6

subtracting 9

-y = -3

then dividing by -1

y = 3

so the solution is x = 3 y = 3 or (3,3)

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3 years ago

The manager of a store wants to have a sales promotion where she gives prizes to the first several people through the door. She

Viktor [21]

The answer is 60 people. Each person would get 4 pins, 6 ornaments and 9 mugs.

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3 years ago

Read 2 more answers

Please help with 3. 4. 5.

Eddi Din [679]

3.
$\text{The Triangle Sum Theorem:}\\m\angle A+m\angle B+m\angle C=180^o$
$x+2x-1+3x+1=180\\6x=180\ \ \ |:6\\x=30$
$x^o=30^o\\(3x+1)^o=(3\cdot30+1)^o=91^o\\(2x-1)^o=(2\cdot30-1)^o=59^o$
4.
$r-6+3r-3+5r=180\\9r-9=180\ \ \ |+9\\9r=189\ \ \ |:9\\r=21$
$(r-6)^o=(21-6)^o=15^o\\(3r-3)^o=(3\cdot21-3)^o=60^o\\(5r)^o=(5\cdot21)^o=105^o$
5.
$\text{The Exterior Angle Theorem:}\\m\angle CAB+m\angle ABC=m\angle DCB$
$2g+9g=110\\11g=110\ \ \ |:11\\g=10$
$m\angle A=2\cdot10^o=20^o\\m\angle ACB=180^o-110^o=70^o\\m\angle B=9\cdot10^o=90^o$

4 0

3 years ago

-2 ⅝ * (4 ⅓)= plzz help

Whitepunk [10]

Answer:

Step-by-step explanation:

Change into improper fraction

$-2\frac{5}{8}*4\frac{1}{3}=\frac{-21}{8}*\frac{13}{3}\\\\ = \frac{-7}{8}*\frac{13}{1}\\\\=\frac{-91}{8}\\\\=-11\frac{3}{8}$

4 0

3 years ago

Solve the formula A=1/2h(a+b)

lapo4ka [179]

Answer:

Step-by-step explanation:

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2 years ago