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alexira [117]
3 years ago
15

Which of the following is the best thing to do as a first step in using substitution to solve the system of equations? A. Solve

the top equation for x. B. Solve the top equation for y. C. Solve the bottom equation for x. D. Solve the bottom equation for y.
Mathematics
1 answer:
elena-s [515]3 years ago
5 0
The best and most correct answer among the choices provided by the question is the first choice. The first step to do during the substitution method is to s<span>olve the top equation for x. </span><span>I hope my answer has come to your help. God bless and have a nice day ahead!</span>
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What is the simplified form of the following expression?
geniusboy [140]

Answer:

242

Step-by-step explanation:

Simplify the following:

11 ((9^2 - 5^2)/2^2 + 8)

Hint: | Evaluate 2^2.

2^2 = 4:

11 ((9^2 - 5^2)/4 + 8)

Hint: | Evaluate 5^2.

5^2 = 25:

11 ((9^2 - 25)/4 + 8)

Hint: | Evaluate 9^2.

9^2 = 81:

11 ((81 - 25)/4 + 8)

Hint: | Subtract 25 from 81.

| 7 | 11

| 8 | 1

- | 2 | 5

| 5 | 6:

11 (56/4 + 8)

Hint: | Reduce 56/4 to lowest terms. Start by finding the GCD of 56 and 4.

The gcd of 56 and 4 is 4, so 56/4 = (4×14)/(4×1) = 4/4×14 = 14:

11 (14 + 8)

Hint: | Evaluate 14 + 8 using long addition.

| 1 |  

| 1 | 4

+ | | 8

| 2 | 2:

11×22

Hint: | Multiply 11 and 22 together.

| 2 | 2

× | 1 | 1

| 2 | 2

2 | 2 | 0

2 | 4 | 2:

Answer: 242

3 0
3 years ago
The function f is given by f(x)=1+3cosx. What is the average rate of change of f over the interval [0,π]?
irga5000 [103]

Answer:

-\frac{6}{\pi}

Step-by-step explanation:

To find the average rate of change, we use the formula

\frac{f(b)-f(a)}{b-a}

Where a=0 and b=\pi

Knowing this, we can plug in all of our know values and simplify.

\frac{1}{\pi} ((1+3cos(\pi ))-(1+3cos(0))\\\\\frac{1}{\pi} ((1-3 ))-(1+3))\\\\\frac{1}{\pi} (-2-4)\\\\-\frac{6}{\pi}

5 0
4 years ago
Find the area and perimeter of the composite shape..
Artyom0805 [142]

Area: 68

Perimeter: 50

5 0
4 years ago
4.2x-1.4y=2.1 <br> Solve for y
givi [52]

Answer: y = -1.5+3x

Step-by-step explanation:

7 0
3 years ago
Which orderd pair is a solution to this equation? -2x-y=4
nevsk [136]
To find the ordered pair solution, you need to find the zero(s) (which are the x-values for which y is equal to zero). This is called the Zero Product Property. Here's the math:

-2x-y=4             convert the equation into slope form

-y=2x+4            multiply both sides by -1

y=-2x-4             convert into factored form

y=-2(x+2)          now, we need to find what x equals that makes y equal zero

0=-2(x+2)          replace y with zero

0/-2=x+2           divide both sides by -2

-2=x                  x=-2 when y=0

Therefore, the zero of the equation (aka the solution) is the ordered pair (-2,0). 

Answer: (-2,0)

If you have access to a graphing calculator, you can just convert the equation to y=mx+b form and enter it as a function. The solution is wherever the graph intercepts the x-axis. Hope this helps!



5 0
4 years ago
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