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
emmainna [20.7K]
3 years ago
15

Solve the system using elimination. 3x – y = 28 3x + y = 14

Mathematics
2 answers:
leonid [27]3 years ago
5 0

Answer:

Step-by-step explanation:

Let 3x-y=28-----------(1)

Let 3x+y =14-----------(2)

(2)-(1)

3x-3x + y-(-y) =14-28

2y=-14

y=-14/2= -7

By adding 1 and 2

3x+3x+(-y)+(y) = 28+14

6x = 42

X=42/7=6

Vikki [24]3 years ago
4 0

Answer:

x= 7, y= -7         or          (7, -7)

Step-by-step explanation:

3x-y=28

3x+y=14

because the y is opposite of each other in both equations you can cancel them out

3x=28

3x=14

next you add 3x to 3x, then 28 to 14 and get...

6x=42

next divide both sides by 6 and you get your answer for x...

x=7

now you must solve for y and you do this by substituting what you found for x in one equation it doesn't matter which because you'll get the same answer but you can check for both to make sure...

3(7)+y=14

21+y=14

y=-21+14

y=-7

You might be interested in
What is the area of the parllelogtam shown below
Umnica [9.8K]
<h3>Answer: 16 square units</h3>

Let x be the height of the parallelogram. Right now it's unknown, but we can solve for it using the pythagorean theorem. Focus on the right triangle. It has legs a = 3 and b = x, with hypotenuse c = 5

a^2 + b^2 = c^2

3^2 + x^2 = 5^2

9 + x^2 = 25

x^2 = 25-9

x^2 = 16

x = sqrt(16)

x = 4

This is a 3-4-5 right triangle.

The height of the parallelogram is 4 units.

We have enough info to find the area of the parallelogram

Area of parallelogram = base*height

Area of parallelogram = 4*4

Area of parallelogram = 16 square units

Coincidentally, the base and height are the same, which isn't always going to be the case. The base is visually shown as the '4' in the diagram. The height is the dashed line, which also happens to be 4 units long.

6 0
3 years ago
Please help! Will mark brainlessest
suter [353]
D.) D’(-3,-16)
Trans station is (x-5,y-16)
5 0
2 years ago
Subtract using a number line. 12−(−5) Select the point on the number line to plot the answer.
andreev551 [17]

It 17 but you didn't give me a number line

7 0
3 years ago
Read 2 more answers
Which sequence is geometric and has 1/4 as its fifth term and 1/2 as the common ratio?
olchik [2.2K]
5th term = a1r^4   where a1 = first term and r = common ratio

so 1/4 = a1 * (1/2)^4

a1 = 1/4 / (1/2)^4  =  4

so the sequence  is  4 , 4*1/2, 4*(1/2)^2...

= 4, 2, 1, 1/2, 1/4 .....
5 0
3 years ago
Read 2 more answers
Determine the slope of the line shown below.
Schach [20]

Answer:

0

It runs parallel to the z-axis and so has a zero slope

3 0
2 years ago
Other questions:
  • One grocery store sells 8 pounds of bananas for $3.12. Another grocery store sells 9 pounds of bananas for $3.06.
    10·2 answers
  • Solve for m<br> 2/5 = m/70 =<br> show work and order of operations
    6·1 answer
  • What scale factors equals 0 .75​
    14·1 answer
  • Ms. Henning wants to purchase 30 calculators for her math class. Calculators cost $14 each. Me. Henning currently has $300 in he
    13·1 answer
  • What is the value of 5 in each of this number 25
    11·1 answer
  • The ratio of boys to girls in the show are 11 to 17. If there are a total of 132 boys, what is the total of students in the show
    12·1 answer
  • Imagine I had a magic spell that could make your house bigger. If you want the biggest house, which spell would you use?
    10·1 answer
  • What is the area of this figure?
    10·1 answer
  • -6-4+[-4] 0 [-4-[-3]]<br> [4² + 3²] ÷ 5
    14·1 answer
  • Which solution shown below contains an error?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!