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Schach [20]
2 years ago
11

Solve using substitution y= 7x + 6 4x - 3y =16

Mathematics
1 answer:
maks197457 [2]2 years ago
4 0

Answer:

{y,x} = {-8,-2}

Step-by-step explanation:

Hope this helps.

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CAN SOMEONE WHO IS GOOD AT MATH HELP PLEESE !! ALSO PLEASE PUT ACTUAL ANWSERS I DONT OPEN SKETCHY FILES ON MY COMPUTER !!
patriot [66]

Step-by-step explanation:

<h2><em><u>THE </u></em><em><u>Question </u></em><em><u>Satisfies </u></em><em><u>For </u></em><em><u>All </u></em><em><u>The </u></em><em><u>Graph</u></em></h2>
7 0
3 years ago
How do you solve this problem? population proportion is to be estimated from a sample of 400 with a sample proportion of 0.1. Ap
Ivan

Answer:

(0.0706, 0.1294)

Step-by-step explanation:

Confidence interval of a proportion is:

CI = p ± CV × SE

where p is the proportion,

CV is the critical value (z score or t score),

and SE is the standard error.

The sample is large enough to estimate as normal.  For 95% confidence level, CV = z = 1.96.

Standard error for a proportion is:

SE = √(pq/n)

SE = √(0.1 × 0.9 / 400)

SE = 0.015

The confidence interval is:

CI = 0.1 ± (1.96)(0.015)

CI = (0.0706, 0.1294)

Round as needed.

6 0
3 years ago
Help all of these are confusing me
swat32

Answer:

  • b
  • b
  • a
  • b

Step-by-step explanation:

There are a few algebraic, geometric, and trig relations you are expected to remember. These come into play in this set of questions.

  • vertex form for equation of a parabola: y = a(x -h)² +k, has vertex at (h, k)
  • Sine Law relates triangle sides and their opposite angles: a/sin(A) = b/sin(B)
  • Cosine Law relates triangle sides and the angle between two of them: c² = a² +b² -2ab·cos(C)
  • SOH CAH TOA reminds you of trig relations in a right triangle
  • relationships of corresponding sides and angles in congruent and similar triangles: angles are congruent; sides are congruent or proportional.

When solving any problem, the first step is to understand what is being asked. The second step is to identify the relevant information and relationships that can help you answer.

<h3>1)</h3>

You are asked for the equation of a parabola with a given vertex. The vertex form equation will be useful. We can assume a scale factor ('a') of 1.

For vertex (h, k) = (1, -4) and a=1, the vertex form equation is ...

  y = a(x -h)² +k

  y = 1(x -1)² +(-4)

  y = (x -1)² -4

<h3>2)</h3>

You are given 3 sides and want to find an angle. The useful relation in this case is the Cosine Law. (If you wanted to use the Sine Law, you would already need to know an angle.)

<h3>3) </h3>

The mnemonic SOA CAH TOA reminds you that the cosine relation is ...

  Cos = Adjacent/Hypotenuse

The side adjacent to angle C is marked 4; the hypotenuse is marked 5. The desired ratio is ...

  cos(C) = 4/5

<h3>4)</h3>

The measure x is also the measure of side AB. The similarity statement lists those letters as the first two. It also lists the letters DE as the first two. The other given side in ΔABC is BC, corresponding to side EF in the smaller triangle. Corresponding sides are proportional, so we have ...

  AB/DE = BC/EF

  x/6 = 10/4

We can find the value of x by multiplying this equation by 6:

  x = 6(10/4) = 60/4

  x = 15

Please note that BC is the shortest side in ΔABC. This means x > 10. There is only one such answer choice. (No math necessary.)

3 0
2 years ago
Read 2 more answers
Don't mind the writing I did it was wrong so plz answer
user100 [1]
Um i dont understand your question


4 0
3 years ago
What is nearest tenth of 20.25?
denis23 [38]
The answer to yur question is 20.3
8 0
3 years ago
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