Linear Equations

[jenzy569]

How are addition and multiplication used to solve a linear equation? Demonstrate by solving 12x + 6 = 31 - 2x

 

[Aladdin]

Solving a Linear equation means find x :

\(\displaystyle 12x + 6 = 31 - 2x\)

\(\displaystyle 12x + 2x = 31 - 6\)

\(\displaystyle 14x = 25\)

\(\displaystyle x = 25/14\)

I this what you wanted ?

 

[jenzy569]

yes. thank you so much! i have another part of the question, if you think you can understand it, because i am so confused!

From the given polynomials, identify the polynomials of degree one.

a. 11y2 – 5 – 4y
b. (3x2)1/2 + 12
c. 7 – (12)1/2x
d. 2x + 13x2
e. 5x + 7y + 8
f. (12)1x1
g. x3 + 2x - 10
h. 3x + 4x - 4

Solve the following:
i. 2x = -3x + 9
ii. 3x/5 = -6
iii. y/4 + 2 = 7
iv. 16 = -2x/3
v. Find f(1) for f(x) = 2x3 - 3x2 + x – 21
vi. A function gives the value of C as 2 × (22/7) × r. Find C when r = 7 cm and r = 91 cm.

 

[Aladdin]

http://www.purplemath.com/modules/polydefs.htm

Show work please.

 

[jenzy569]

I'm not sure how this will help me. I am still confused.

 

[Aladdin]

yes. thank you so much! i have another part of the question, if you think you can understand it, because i am so confused!

From the given polynomials, identify the polynomials of degree one.

a. 11y2 – 5 – 4y --> It's a second degree polynomial,
The degree of a non-zero polynomial is the largest degree of any one term. In this example, the polynomial has degree two.


b. (3x2)1/2 + 12
c. 7 – (12)1/2x Look at this one ?? what degree is it.
d. 2x + 13x2
e. 5x + 7y + 8
f. (12)1x1 ---> is thier any variable here
g. x3 + 2x - 10
h. 3x + 4x - 4 ---- > ???

Solve the following:
i. 2x = -3x + 9
ii. 3x/5 = -6
iii. y/4 + 2 = 7
iv. 16 = -2x/3
v. Find f(1) for f(x) = 2x3 - 3x2 + x – 21
vi. A function gives the value of C as 2 × (22/7) × r. Find C when r = 7 cm and r = 91 cm.

http://www.purplemath.com/modules/solvelin.htm

Go to google search,