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polet [3.4K]
3 years ago
13

Help!! I have no clue

Mathematics
2 answers:
netineya [11]3 years ago
5 0

So we know that an ordered pair looks like (x,y), right? For this inequality, we're supposed to plug in the values of x and y. If it isn't true, then the inequality does not represent the ordered pair.

First option: (0,1)

2x + 3y \geq -1 --> 2(0) + 3(1) \geq -1 --> 5 \geq -1

So this option is correct.

Second option: (-2,1)

2x + 3y \geq -1 --> 2(-2) + 3(1) \geq -1

--> -4 + 3 \geq -1 --> -1 \geq -1

This is also correct.

Third option: (-6,0)

2(-6) + 3(0) \geq -1 --> -12 \geq -1

This is not true, so this option is not correct.

Fourth option: (0,-1)

2(0) + 3(-1) \geq -1 --> -3 \geq -1

This is not correct.

Fifth option: (2,-1)

2(2) + 3(-1) \geq -1 --> 4 - 3 \geq -1

This is correct.

VikaD [51]3 years ago
3 0

okay so you just plug in the x and ys. x is the first number, y is the second. then you just do them all out

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r1 = d1/2
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3 years ago
Solve: 21= 14 +7x<br> A x=5<br> B x=1<br> C<br> X = -1<br> D X = -5
Andreyy89

Answer:

Your answer is b

Step-by-step explanation:

Here you go mate

Step 1

21=14+7x  Equation/Question

Step 2

21=14+7x  Simplify

21=14+7x

Step 3

21=14+7x  Subtract 14x

7x=7

Step 4

7x=7  Divide by 7

answer

1

Hope this help

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The dunk family own a property in the shape of an L. The property is to be shared between four children so that each receives th
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What is the answer / product of 8x2
Mademuasel [1]

Reformatting the input :

Changes made to your input should not affect the solution:

(1): "x2"   was replaced by   "x^2".  

Rearrange:

Rearrange the equation by subtracting what is to the right of the equal sign from both sides of the equation :

                    8*x^2-(8)=0  

Step by step solution :

STEP

1

:

Equation at the end of step 1

 23x2 -  8  = 0  

STEP

2

:

STEP

3

:

Pulling out like terms

3.1     Pull out like factors :

  8x2 - 8  =   8 • (x2 - 1)  

Trying to factor as a Difference of Squares:

3.2      Factoring:  x2 - 1  

Theory : A difference of two perfect squares,  A2 - B2  can be factored into  (A+B) • (A-B)

Proof :  (A+B) • (A-B) =

        A2 - AB + BA - B2 =

        A2 - AB + AB - B2 =

        A2 - B2

Note :  AB = BA is the commutative property of multiplication.

Note :  - AB + AB equals zero and is therefore eliminated from the expression.

Check : 1 is the square of 1

Check :  x2  is the square of  x1  

Factorization is :       (x + 1)  •  (x - 1)  

Equation at the end of step

3

:

 8 • (x + 1) • (x - 1)  = 0  

STEP

4

:

Theory - Roots of a product

4.1    A product of several terms equals zero.  

When a product of two or more terms equals zero, then at least one of the terms must be zero.  

We shall now solve each term = 0 separately  

In other words, we are going to solve as many equations as there are terms in the product  

Any solution of term = 0 solves product = 0 as well.

Equations which are never true:

4.2      Solve :    8   =  0

This equation has no solution.

A a non-zero constant never equals zero.

Solving a Single Variable Equation:

4.3      Solve  :    x+1 = 0  

Subtract  1  from both sides of the equation :  

                     x = -1

Solving a Single Variable Equation:

4.4      Solve  :    x-1 = 0  

Add  1  to both sides of the equation :  

                     x = 1

Two solutions were found :

x = 1

x = -1

3 0
2 years ago
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