Choose a system and make a case for why you would

Mathematics

1 answer:

Elenna [48]2 years ago

3 0

Answer:

The method of solving "by substitution" works by solving one of the equations (you choose which one) for one of the variables (you choose which one), and then plugging this back into the other equation, "substituting" for the chosen variable and solving for the other.

Step-by-step explanation:

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What is the solution set of y = x2 + 2x + 7 and y = x + 7? A. {(0, 7), (-1, 6)} B. {(0, 7), (-7, 0)} C. {(0, 7), (1, 8)} D. {(-2

Elena-2011 [213]

Answer:

Step-by-step explanation:

$y=x^2+2x+7$ AND

y = x + 7, then by the transitive property of equality:

$x^2+2x+7=x+7$

We can solve for the values of x by getting everything on one side of the equals sign and then solving for x:

$x^2+x=0$

We can factor out the common x to get:

x(x + 1) = 0

which tells us by the Zero Product Property that either

x = 0 and/or x + 1 = 0 and x = -1

We are expecting 2 solutions for x since this is a second degree polynomial. We will sub both -1 and 0 into y = x + 7 to solve for the corresponding values of y

y = 0 + 7 so

y = 7 and the coordinate is (0, 7)

y = -1 + 7 so

y = 6 and the coordinate is (-1, 6)

8 0

3 years ago

PLZ HELP! Use technology or a z-score table to answer the question.

Rashid [163]

Answer:

the answer would be A, or 5.3%

Step-by-step explanation:

you start by finding the z-score of 200, so 200-144.05 = 55.95/34.52 = 1.62 (rounded to the nearest ) Then you use a z-score table to find the probability that a customer will spend less than 200 dollars and subtract the decimal probability from one. then you convert the decimal probability to a percent and get 5.3%.

7 0

3 years ago

Brittany is making hair bows to sell at a craft show. Each hair bow requires 3/4 yard of ribbon. Brittany plans to make 50 bows.

uranmaximum [27]

A. 50 x (3/4) = 37.5

6 0

3 years ago

What is the value of x? *36 *72 *108 *144

Anit [1.1K]

Answer:

Step-by-step explanation:

6 0