1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Novay_Z [31]
3 years ago
7

Bethany says that 3x+6+x and 3(x+2) and equivalent expressions. She used substitution to support her answer. Explain what Bethan

y did wrong
Mathematics
1 answer:
Vinvika [58]3 years ago
3 0

She forgot about the final x at the end, because the first expression is 3x+6+x, and the second one is 3(x+2). The second one expands to 3x+6, but it doesn't have the final term at the end.

Also, 3 is not really a factor of x (technically it could be because x in unknown, but in terms of like terms and stuff it isn't) so you can't take a 3 out of x (unless you leave it as 1/3x I guess).

Anyway, yeah she forgot about the final x and therefore the factor she took out is incorrect anyway. She also could've simplified the first expression so that it became 4x + 6

You might be interested in
Find the slope of the line passing through the pairs of points and describe the line as rising, falling, horizontal or vertical.
Anna [14]

Answer:

a.\ m=2,\ \text{the line is rising}\\\\b.\ m=-\dfrac{5}{4},\ \text{the line is falling}\\\\c.\ m=0,\ \text{the line is horizontal}\\\\d.\ m\ is\ unde fined,\ \text{the line is vertical}

Step-by-step explanation:

The formula of a slope:

m=\dfrac{y_2-y_1}{x_2-x_1}

If

m > 0, then a line is rising

m < 0, then a line is falling

m = 0, then a line is horizontal

m is undefined, then a line is vertical

<h2>a.</h2>

(2, 1) and (4, 5)

m=\dfrac{5-1}{4-2}=\dfrac{4}{2}=2>0\to\text{rising}

<h2>b.</h2>

(-1, 0) and (3, -5)

m=\dfrac{-5-0}{3-(-1)}=\dfrac{-5}{4}=-\dfrac{5}{4}

<h2>c.</h2>

(2, 1) and (-3, 1)

m=\dfrac{1-1}{-3-2}=\dfrac{0}{-5}=0\to\text{horizontal}

<h2>d.</h2>

(-1, 2) and (-1, -5)

m=\dfrac{-5-2}{-1-(-1))}=\dfrac{-7}{0}\ \text{UNDEFINED}\to\text{vertical}

7 0
3 years ago
Solve the system by substitution <br><br> -8x+y=-9<br> y=7
aleksandr82 [10.1K]
In point for (2,7) and in Equation form x=2 y=7
6 0
3 years ago
H(x)=4x+3<br> Domain: all real number<br> Find range
CaHeK987 [17]

don't know if this might help but here

Step-by-step explanation:

(−∞,∞),{y|y∈R}

4 0
2 years ago
Brainlist and 45 Points
shtirl [24]

Answer:

D

Step-by-step explanation:

The only option with coordinates within the triangle is D.

Coordinates included within the triangle. (-1, 0), (-1, -2), and <em>(-1, -1) </em>

(-1, -1) is the only one listed in the given options.

5 0
3 years ago
You roll three die. what is the probability that 5 will not appear on the die?
castortr0y [4]
No of out comes =216
favorable outcome=3 
<span>probability that 5 will not appear on the die=3/216</span>
7 0
3 years ago
Other questions:
  • How do you solve this complex fraction
    14·1 answer
  • What is the greatest common factor of 60 and 72
    13·1 answer
  • Find the measure of the angle indicated in bold
    6·1 answer
  • HELP QUICK ILL GIVE THE BRAINLIEST!
    14·1 answer
  • -10.74=u-(-11) help
    13·1 answer
  • PLEASE HELP!!! I WILL MARK BRAINLEST!!!
    9·1 answer
  • Find the GCF of 52 and 84.​
    11·1 answer
  • Kindly answer this question it would be really helpfull
    6·1 answer
  • Layla calculates the mean of the ages of 10 students on her bus, and she discovers the average(mean) age is 12.8. What will happ
    10·1 answer
  • The width of a rectangle is one half its length. The perimeter of the rectangle is 54 cm. What are the width and length of the r
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!