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
Elena-2011 [213]
2 years ago
12

Solve the system of equations x - y = 12 and x + 7y = -20 by combining the equations.

Mathematics
2 answers:
svetoff [14.1K]2 years ago
8 0

Answer:

x= 8, y= -4

Step-by-step explanation:

You can subtract one equation by another to eliminate x

(x-y)-(x+7y)=12-(-20)

-8y = 32

y= -4

Substitute y =  -4 in the first equation:

x-(-4) = 12

x =8

iogann1982 [59]2 years ago
7 0

Answer:

x=16, y=-4

Step-by-step explanation:

-1(x-y=12)

x+7y=-20

-x+y=-12

x+7y=-20

8y=-32

y=-4

x-4=12

x=16

You might be interested in
What is the slope and y-intercept of line q graphed below?
beks73 [17]

The correct answer is C) 1/3 and (0, 1)

The y-intercept part is somewhat simple. In order for it to be a y-intercept, the x value of the ordered pair must be 0. That is only true in B and C, therefore they are the only possible answers.

To find the slope, we must choose two points on the line and use the slope formula. We can start by using the y-intercept (0, 1) and also (3, 2). Now we use the slope formula.

m = (y2 - y1)/(x2 - x1)

In this equation m is equal to slope, the first point is (x1, y1) and the second point is (x2, y2)

m = (y2 - y1)/(x2 - x1)

m = (2 - 1)/(3 - 0)

m = 1/3

Now knowing the slope, you can match this with answer C.

3 0
2 years ago
On January 16 the temperature in Boston was -8 degrees at 4:00am and it when began to rise 3degrees every hours. What was the te
ANTONII [103]

Answer:

22 degrees

Step-by-step explanation:

6 0
3 years ago
Jessica drank 1/8 gallon of orange juice
irakobra [83]
And what else you can not solve that problem
6 0
3 years ago
Tell whether the given value is a solution of the inequality.<br> x + 1 &gt; 10; x = 9
Oliga [24]

Answer:

given x+1 > 10,

x > 10 - 1

x > 9

which means x MUST BE more than 9 , which also means 9 isnt included in the inequality therefore x = 9 is not a solution.

6 0
2 years ago
1. The handwritten rough draft of your book report is 4 pages long. Typing
alexandr402 [8]

Answer:

The report is 960 words long.

Step-by-step explanation:

The handwritten book report is 4 pages long and the typed report is 3 pages long.

Now, it is given that typing at a steady rate of 20 words per minute, it takes 48 minutes to enter the report into soft copy.

So, the required number of words of the report is (20 × 48) = 960 words.  

Hence, the report is 960 words long. (Answer)

3 0
3 years ago
Other questions:
  • True or false and if false what would be the correct term be?
    14·1 answer
  • If f(x) =5x, what is f(6)
    15·1 answer
  • A hawk soars at an altitude of 1,800ft. If the hawk descends to the ground in 45 min, what is the vertical speed?
    5·2 answers
  • Come on smart heads . Earn you some points with this easy problem . I know you can do it !!!
    14·1 answer
  • Solve for x. 3x - 1 = 27 x = 10 x = x =
    12·1 answer
  • In a Calif. study, Dean Lester Breslow and Dr. James Enstrom of the UCLA School of Public Health concluded that by following 7 s
    8·1 answer
  • Please solve
    10·1 answer
  • Nathaniel and meteorologists keep track of the amount of rain each year relative to the amount of rain in 2000 two years of data
    8·2 answers
  • A laundry basket has 24 socks in it. Six were navy, 10 were black, and the remaining were white, What is the probability of draw
    9·2 answers
  • As an estimation we are told £3 is €4.<br> Convert €32 to pounds.<br><br><br> help pleaseeee!
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!