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
valkas [14]
3 years ago
6

A variable needs to be eliminated to solve the system of equation below. Choose the correct first step.

Mathematics
1 answer:
prohojiy [21]3 years ago
4 0

Answer:

3

−

9

=

−

3

9

3

−

6

=

-21

Step-by-step explanation:

3x​−9y=−39, 3x−6y=−21 : x=5, y=6

Steps

[ ​3x−9y=−39 3x−6y=−21 ]

Show Steps

Isolate x for 3x−9y=−39: x=−13+3y

Substitute x=−13+3y

[ 3(−13+3y)−6y=−21 ]

Show Steps

Simplify

[ −39+3y=−21 ]

Show Steps

Isolate y for −39+3y=−21: y=6

For x=−13+3y

Substitute y=6

x=−13+3· 6

Simplify

x=5

The solutions to the system of equations are:

You might be interested in
Find an equation of the plane that contains (3, 4, −9) and is parallel to x + y − 5z = 1. (Use x, y, and z for coordinates.)
emmainna [20.7K]

Answer:

x + y - 5z = 52

Step-by-step explanation:

Given data:

Point on the plane (3,4,-9)

parallel to x + y -5z = 1

Finding the normal vector

(1 , 1 , -5)(x, y , z) = 1

the normal vector is (1 , 1 , -5)

<em>formula for finding equation the plane given the normal vector (a,b,c) and point (m,n,o) is as </em>

<em>a(x - m) + b(y - n) + c(z-o)=0</em>

Substituting the data we have

1(x-3) + 1( y- 4) - 5(z+9) =0

x-3 +y -4 -5z -45 = 0

x + y - 5z = 45 +4 +3

x + y - 5z = 52

6 0
3 years ago
It is difficult to change how good I am at math even if I try hard and practice a lot.
vodomira [7]

Answer:

B

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Cos^2 2A+4sin^2A×cos^2 A=1
Nonamiya [84]
Using Sin^2 and Cos^2 identities,
= Cos^2(2A) + 4[(1/2)(1-Cos(2A)][(1/2)(1+Cos(2A)] = 1
= Cos^2(2A) + 1 -Cos^2(2A) = 1
   0 = 0
There is nothing to solve for as it is an identity of sorts.

3 0
3 years ago
1 One number is 2 more than 3 times another number.
Cerrena [4.2K]

Answer:

x=3y+2

14-y=3y+2

12=4y

3=y ANSWER 1: One of the numbers is 3.

.

x=14-y=14-3=11 ANSWER 2: The other number is 11.

5 0
3 years ago
HELP ME PLS I WILL GIVE BRANINEST
tresset_1 [31]

Answer:

Angle A = 180

Step-by-step explanation:

180=7x+40

Subtract 40 from both sides

140 = 7x

Divide 7 from both sides

20=x

Substitue 20 in for x

7(20)+40

140+40 = 180

3 0
3 years ago
Read 2 more answers
Other questions:
  • Help please and thank you!!!!!
    7·1 answer
  • For what values of the numbers a and b does the function below have maximum value f(1) = 4? (Round the answers to three decimal
    8·1 answer
  • A local bakery uses 1.75 cups of flour in each batch of cookies. The bakery used 5.25 cups of flour, that means they made 3 batc
    6·1 answer
  • Mean, Mode, Med<br> 86, 12, 11, 12, 15, 29, 59, -40
    8·1 answer
  • MAX POINTS PLEASE HELP ASAP LAST QUESTION WILL MARK BRAINLIEST MULTIPLE CHOICE
    7·2 answers
  • What is 13 out of 25 as a decimal? <br><br> Plzzz help
    8·1 answer
  • Write the equation in standard form using integers y=2/3x-3
    15·1 answer
  • Andrea has 1/4 of a sack of rice. She divides the rice equally
    8·1 answer
  • GIVING BRAINLIEST!!!PLS HELP!! :((
    8·1 answer
  • Standard deviation of 0.116 minute. The winning car that year, driven by Tammy, finished in 110.49 minutes. Find their respectiv
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!