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
3+(-h)+(-4)where h = -7.
Lina20 [59]

Answer:

6

Step-by-step explanation:

3+(-h)+(-4)

Let h = -7

3+(- -7)+(-4)

3+(7)+(-4)

10 -4

6

4 0
3 years ago
X^2 -10x -24 =0<br><br><br> A. (x-4)^2=49<br> B. (x-5)^2=16 <br> C. (x-5)^2 =49<br> D. (x-8)^2=64
blondinia [14]

Answer:

B

Step-by-step explanation:


4 0
3 years ago
5/6 n=10 what is n in this equation
svp [43]
N=12
Since 5/6 and n is being multiplied, you have to divide the 5/6 from both sides. When you divide with a fraction, you have to find it’s reciprocal and multiply with it. So the 5/6 turns into 6/5
5/6 * 6/5 = 30/30 which is one.
10 * 6/5 is 60/5
60/5= 12
6 0
2 years ago
A rectangular price tag has a perimeter of 28 centimeters. Its area is 40 square centimeters.
BlackZzzverrR [31]

Answer:

░░░░░▐▀█▀▌░░░░▀█▄░░░ ░░░░░▐█▄█▌░░░░░░▀█▄░░ ░░░░░░▀▄▀░░░▄▄▄▄▄▀▀░░ ░░░░▄▄▄██▀▀▀▀░░░░░░░ ░░░█▀▄▄▄█░▀▀░░ ░░░▌░▄▄▄▐▌▀▀▀░░ This is Bob ▄░▐░░░▄▄░█░▀▀ ░░ ▀█▌░░░▄░▀█▀░▀ ░░ Copy And Paste ░░░░░░░▄▄▐▌▄▄░░░ So, He Can Take ░░░░░░░▀███▀█░▄░░ Over Brainly Join the cult today

Step-by-step explanation:

bob is life

bob is food

bob is bob

5 0
2 years ago
a skateboard park is a shape of a trapezoid this area is 550 square meters the bases or 15 meters in 35 meters what is the Heigh
anyanavicka [17]

Hello,

( 550 m² × 2 ) ÷ ( 35 m + 15 m )
→ 1 100 m² ÷ 50 m
→ 22 m

Bye :)

4 0
2 years ago
Other questions:
  • The equation y = 35.25x + 40 gives the labor cost y of repairing a car if it takes x hours to repair the car. Which statement is
    15·1 answer
  • How to solve 5a + c = -8a
    8·1 answer
  • Use De Morgan's laws to write an equivalent statement for the sentence. The bus does not have an engine or the people do not hav
    9·1 answer
  • 7.05, 5.07,7.5,0.57 least to greatest
    15·2 answers
  • Find the length of the third side to the nearest tenth.<br> Hurry need help asap!!
    10·1 answer
  • Ming works as a quality assurance analyst at a bottling factory. She wants to use a one-sample z interval to estimate what propo
    12·1 answer
  • HELPP!!!! Is the first one right? and if not can u correct it also can u help me on the other ones plz!!!!???
    7·1 answer
  • Determine whether quadrilateral EFGH is similar to quadrilateral QRST. If so, give the similarity statement. (ASAP PLS HELP!! no
    12·1 answer
  • HELP ME PLEASE ASAP
    11·2 answers
  • Help which graph describes exponential decay
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!