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3 years ago

2x + y = 3 2x – y = 4 Using elimination to solve this system results in the equation .

2 answers:

8 0

You can use elimination by adding the two equations to "cancel out" one of the variables. in this example y will cancel out.

2x + y = 3
+
2x - y = 4
________
2x = 6
x = 3

now that we know our x value, we can plug it into one of the other equations to get our y value.

2(3) + y = 3
6 + y = 3
y = -3

your answer for this system is x=3, y=-3

Ronch [10]3 years ago

8 0

Answer:

0=7

Step-by-step explanation:

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Studentka2010 [4]

Answer:

work

Step-by-step explanation:

work hard and get into a good school and live a life

8 0

3 years ago

Find the area of the shade regions. Give your answer as a completely simplify exact value in terms of pie(no approximation). a=

mr Goodwill [35]

Answer:

125.6 in²

Step-by-step explanation:

Area shaded :

2 × Sector (72°)
2 x πr² x θ/360
2 x 3.14 x 100 x 72/360
6.28 x 100 x 1/5
20 x 6.28
125.6 in²

4 0

2 years ago

8 < -3x + 10 greater than sign meaning greater than or equal to!

goldfiish [28.3K]

Answer:

2/3 >=x

Step-by-step explanation:

8 =< -3x + 10

subtract 10 from each side

8-10 <= -3x+10-10

-2 <=-3x

divide by -3 (remember to flip the inequality)

-2/-3 >= -3x/-3

2/3 >=x

4 0

3 years ago

Read 2 more answers

Please help me :((!!!!

Alika [10]

This seems like a concept you’re going to learn and use so I’ll do a problem per section and explain.

Well basically this is a concept: if it’s a negative exponent it’s just 1/number^exponent.

So for example:
#1. 1/(10)^2 = 10^-2

The standard notation:
#9: You know that 1/(10)^3 you could either put it in a calculator or realize that you take the number 1, and move the decimal to the left three times. 0.001 would be the answer.

Scientific notation:
combines these topics. Let’s take #17. 0.025. Scientific notation means you write it as a number multiplied by 10^? So let’s see how many places you can move the decimal to get a number without the zeros.

0.025 => move it two places to the right. So that’s 2.5. Now 2.5 multiplied by what 10^? Would give you 0.025? It would be 10^-2. So your answer would be 2.5 x 10^-2.

For all of these, use your knowledge of the power of tens and dividing by tens! ^^ you got this. Let me know if you need help after this explanation.

7 0

3 years ago

Theorem: The segment joining the midpoints of two sides of a triangle is parallel to the third side and half its length. A two-c

natali 33 [55]

Answer: By the slope formula.

Step-by-step explanation:

Given: ABC is a triangle (shown below),

In which A≡(6,8), B≡(2,2) and C≡(8,4)

And, D and E are the mid points of the line segments AB and BC respectively.

Prove: DE║AC and DE = AC/2

Proof:

Since, And, D and E are the mid points of the line segments AB and BC respectively.