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
natta225 [31]
2 years ago
7

8х + 5у = -7 — 7х + бу = — 4

Mathematics
1 answer:
Levart [38]2 years ago
7 0

Answer: x = -0.2651 and y = -0.9759

Step-by-step explanation:

Solution by substitution method

8x+5y= -7

-7x+6y= -4 = 7x-6y=4

Suppose,

8x+5y=-7→(1)

7x-6y=4→(2)

Taking equation (1), we have

8x+5y= -7

⇒8x= -5y -7

⇒x= -5y-7 / 8 →(3)

Putting x= -5y-7 / 8

in equation (2), we get 7x-6y=4

7(-5y-7/8)-6y=4

⇒-35y-49-48y=32

⇒-83y-49=32

⇒-83y=32+49

⇒-83y=81

⇒y= 81 / -83

⇒y= -0.9759→(4)

Now, Putting y= -0.9759 in equation (3), we get

x= -5y-7

x= -5(-0.9759)-7/8

⇒x= 4.8795-7/8

⇒x= -2.1205/8

⇒x= -0.2651

∴x= -0.2651 and y = -0.9759

You might be interested in
kevin’s savings accounts had x dollars in it at the beginning of the month.at the end of the month,there was 4% more money in ke
Arisa [49]

Answer:

1.04x

Step-by-step explanation:

Let

x -----> Kevin’s savings accounts amount at the beginning of the month

Remember that

100\%+4\%=104\%=104\100=1.04

we know that

The amount in Kevin’s account at the end of the month is equal at the amount at the beginning of the month multiplied by 1.04

so

1.04x

4 0
3 years ago
0.6(10m-5n) do you know this
DIA [1.3K]
0.6*10m=6m  0.6*5n=3n rewrite 6m-3n
hope this helps have a nice nite
5 0
2 years ago
**PLEASE HELP ME ASAP**
Phantasy [73]
1) m=8d      $40
2) d=15h      45 mi
3) less than one hour
5 0
3 years ago
Help me with #5 pleaseeeeeeeeeee
earnstyle [38]

Answer:

\angle 1 = 45 degrees

Step-by-step explanation:

Sum of 3 angles in a triangle is 180..

The angles given are:

60

7x + 12

1

So we sum to 180 and write:

60+7x+12+\angle 1=180\\72+7x+\angle 1=180\\7x+\angle 1=108

Also, straight angle is 180 degrees, thus Angle 1 and (14x + 9) angle is sum to 180, thus we can write:

14x+9+\angle 1=180\\14x + \angle 1=171

Or we can write this as:

14x + \angle 1=171\\\angle 1 = 171 - 14x

We substitute this expression for Angle 1 into 1st equation we got and solve for x first,

7x+\angle 1 = 108\\7x+( 171 - 14x)=108\\-7x=-63\\x=9

Since x = 9, the angle "14x + 9" would be:

14(9) + 9 = 135

Hence Angle 1 would be:

\angle 1 + 14x + 9 = 180\\\angle 1 + 135 = 180\\\angle 1 = 45

6 0
2 years ago
What is the product of 379 and 8
levacccp [35]
Product means multiplication, so I would multiply 379 and 8.
379 x 8 = 3032
<span>3032 is directly in between 3031 and 3033</span>
6 0
2 years ago
Read 2 more answers
Other questions:
  • For every 5 apples that Sean picks, Ashley picks 9. Yesterday, they picked a combined total of 168 apples. How many apples did A
    9·1 answer
  • (-12a^3b^5)/(4a^2b^7)
    14·1 answer
  • Why is scientific notation useful and how is scientific notation used in the real world ?
    5·2 answers
  • Greg has 4 shirts: a white one, a black one, a red one, and a blue one. He also has two pairs of pants, one blue and one tan. Wh
    6·2 answers
  • Given: AB tangent to circle O at B, and secant through point A intersect the circle at points C and D. Find CD, if
    10·1 answer
  • Help meh pls 【=◈︿◈=】 What division problem does this area model represent?
    10·1 answer
  • A rectangular pool measures 10m by 5m. A deck, of uniform width, is to be built all the way around the pool such that the total
    11·1 answer
  • The slope of the line below is-2. Which of the following is the point-slope
    10·1 answer
  • Over what interval is the graph of y = 2 + (x − 3)2 increasing?
    5·1 answer
  • Help with this please
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!