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
dimaraw [331]
3 years ago
14

Raj tried to solve the system below.

Mathematics
2 answers:
padilas [110]3 years ago
8 0

Answer:

c

Step-by-step explanation:

edg 2020

jekas [21]3 years ago
3 0

Answer: Option C) Raj forgot the negative when substituting -15+9x for y.


Solution:

(1) 9x-y=15

(2) 2x+8y=28

Isolating y in the first equation. Subtracting 9x both sides of the equation:

(1) 9x-y-9x=15-9x

Subtracting:

(1) -y=15-9x

Multiplying both sides of the equation by -1:

(1) (-1)(-y)=(-1)(15-9x)

(1) y=-15+9x

Then Raj found the value of y. It's not option D.

Substitutng y by -15+9x in the second equation:

(2) 2x+8(-15+9x)=28

Then option C) is the answer: Raj forgot the negative when substituting -15+9x for y.

Eliminating the parentheses applying the distributive property in the multiplication:

(2) 2x-120+72x=28

Adding similar terms:

(2) 74x-120=28

Solving for x. Adding 120 both sides of the equation:

(2) 74x-120+120=28+120

Adding:

(2) 74x=148

Dividing both sides of the equation by 74:

(2) 74x/74=148/74

Dividing:

(2) x=2

Solving for y: Replacing x by 2 in the first equation:

(1) y=-15+9x

(1) y=-15+9(2)

Multiplying:

(1) y=-15+18

Subtracting:

(1) y=3  

You might be interested in
The formula V = s3 give the volume V of a cube with side length s.
LekaFEV [45]

Answer:

8 inches cubed

Step-by-step explanation:

We get the formula in the task description:

V = s^3

The next sentence tells us s = 2in, so:

V = (2in)^3 = 8in^3

6 0
2 years ago
Read 2 more answers
Sheila walked 7.7 km to the library, if 1 mile = 1.6 km, about how many miles did she walk?
sweet [91]

Answer:

it would be 5

Step-by-step explanation:

1.6 times 5 equals 8

4 0
3 years ago
Read 2 more answers
029494737+8489949494
skelet666 [1.2K]

Answer:

8519444231

I hope this helps!

4 0
2 years ago
Read 2 more answers
Please help !!!!!!!!!
Kaylis [27]

Answer:

9) JK = 24.5

10) LM = 24.5

11) m∡L = 51°

12) m∡M = 129°

Step-by-step explanation:

in a parallelogram, adjacent angles are supplementary (add to 180 degrees) and are also congruent

so, ∡K = ∡M and ∡J = ∡L

since ∡'s L and M are adjacent we can add them and set them equal to 180

5z - 6 + 2z - 3 = 180

7z - 9 = 180

7z = 189

z = 27

therefore, m∡M = 5(27)-6 = 129 and m∡L = 180-129, or 51

Also in a parallelogram, opposite sides are equal; so KJ = LM and KL = JM

7x = 3x + 14

subtract 3x from each side to get:

4x = 14

x = 14/4 = 3.5

to find measure of JK, substitute 3.5 for 'x' to get (3.5)(7) = 24.5

to find measure of LM, substitute 3.5 for 'x' to get (3.5)(3)+14 = 24.5

6 0
2 years ago
Which set of numbers could represent the lengths of the sides of a right triangle?
vitfil [10]

in this problem what you are really looking for is which of these sets is a pathagorean triple. That means it will solve the pathagorean theorem. (a sqaured + b squared = c squared) c is always going to be the largest number or the hypotenuse. if you plug all the number sets into the theorem, only one works and that is 7, 24, 25 which is your answer.

4 0
3 years ago
Other questions:
  • -6(15) explain please and thank you
    10·2 answers
  • 3 3/5 times (-8 1/3)
    10·1 answer
  • For the line y=2/5x if the y-coordinate is 20 what is the x-coordinate
    11·1 answer
  • How do I prove this?
    10·1 answer
  • The price of a pair of shoes increases from $65 to $81. What is the percent increase to the
    14·1 answer
  • Select all the pairs of like terms in the expression<br> Lots of points
    14·1 answer
  • The box plot shows the daily attendance at a Fitness Class. What is the median?
    9·1 answer
  • Solve for m.
    11·1 answer
  • In a class, there are 15 boys and 20 girls. What is the ratio of boys to girls in this class?
    13·2 answers
  • 7. One track coach wants his athletes to race 10 miles around a track to measure how fast
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!