All categories

3 years ago

Solve the pair of simultaneous equations: 2x + y=7 x-2y+1

2 answers:

4 0

2x + y = 7 is an eqn of a straight liney = -2x +7with a slope of -2, and an intercept of 7 the table is for a straight line with a positive slope of 2found from e.g using the first two points in the table: (1 - -1)/(-3 - -4) = 2and an intercept of 7y = 2x + 7 or-2x + y = 7

makkiz [27]3 years ago

4 0

This is middle school right

You might be interested in

Find the numbers b such that the average value of f(x) = 7 + 10x − 9x2 on the interval [0, b] is equal to 8.

barxatty [35]

Answer:

The numbers $b$ such that the average value of $f(x) = 7 +10\cdot x - 9\cdot x^{2}$ on the interval [0, b] is equal to 8 are $b_{1} \approx 1.434$ and $b_{2} \approx 0.232$ .

Step-by-step explanation:

The mean value of function within a given interval is given by the following integral:

$\bar f = \frac{1}{b-a}\cdot \int\limits^b_a {f(x)} \, dx$

If $f(x) = 7 +10\cdot x - 9\cdot x^{2}$ , $a = 0$ , $b = b$ and $\bar f = 8$ , then:

$\frac{1}{b}\cdot \int\limits^b_0 {7+10\cdot x -9\cdot x^{2}} \, dx = 8$

$\frac{7}{b}\int\limits^b_0 \, dx + \frac{10}{b} \int\limits^b_0 {x}\, dx - \frac{9}{b} \int\limits^b_0 {x^{2}}\, dx = 8$

$\left(\frac{7}{b} \right)\cdot b + \left(\frac{10}{b} \right)\cdot \left(\frac{b^{2}}{2} \right)-\left(\frac{9}{b} \right)\cdot \left(\frac{b^{3}}{3} \right) = 8$

$7 + 5\cdot b - 3\cdot b^{2} = 8$

$3\cdot b^{2}-5\cdot b +1 = 0$

The roots of this polynomial are determined by the Quadratic Formula:

$b_{1} \approx 1.434$ and $b_{2} \approx 0.232$ .

The numbers $b$ such that the average value of $f(x) = 7 +10\cdot x - 9\cdot x^{2}$ on the interval [0, b] is equal to 8 are $b_{1} \approx 1.434$ and $b_{2} \approx 0.232$ .

7 0

3 years ago

How do you find the surface area of this prism?

Vlad1618 [11]

Length * width* height

8 0

3 years ago

One seal weights 22 pounds.Another seal weighs three thins. As much how much do the seals weigh altogether

ExtremeBDS [4]

Answer:

88 lbs

Step-by-step explanation:

22+22(3)=88

3 0

3 years ago

Fill out the following table.

Andrei [34K]

Answer: you need to keep dividing

Step-by-step explanation:

I think

3 0

2 years ago

Grayson is a kickboxing instructor who will be teaching classes at a local gym. To get certified as an instructor, he spent a to

Dmitrij [34]

Answer:

If Jeffrey takes 50 classes in his first month as an instructor, he will earn back the amount he spent on certification.

Step-by-step explanation:

7 0

2 years ago