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
Rudik [331]
2 years ago
6

Math Questions :3 thank uu <3

Mathematics
1 answer:
coldgirl [10]2 years ago
8 0
14.       1.5, 10    <- Answer
15.       5,1          <- Answer

Proof 14 

Solve the following system:
{2 x - y = -7 | (equation 1)
4 x - y = -4 | (equation 2)
Swap equation 1 with equation 2:
{4 x - y = -4 | (equation 1)
2 x - y = -7 | (equation 2)
Subtract 1/2 × (equation 1) from equation 2:
{4 x - y = -4 | (equation 1)
0 x - y/2 = -5 | (equation 2)
Multiply equation 2 by -2:
{4 x - y = -4 | (equation 1)
0 x+y = 10 | (equation 2)
Add equation 2 to equation 1:
{4 x+0 y = 6 | (equation 1)
0 x+y = 10 | (equation 2)
Divide equation 1 by 4:
{x+0 y = 3/2 | (equation 1)
0 x+y = 10 | (equation 2)
Collect results:
Answer: {x = 1.5               
                y = 10

Proof 15. 

Solve the following system:
{5 x + 7 y = 32 | (equation 1)
8 x + 6 y = 46 | (equation 2)
Swap equation 1 with equation 2:
{8 x + 6 y = 46 | (equation 1)
5 x + 7 y = 32 | (equation 2)
Subtract 5/8 × (equation 1) from equation 2:{8 x + 6 y = 46 | (equation 1)
0 x+(13 y)/4 = 13/4 | (equation 2)
Divide equation 1 by 2:
{4 x + 3 y = 23 | (equation 1)
0 x+(13 y)/4 = 13/4 | (equation 2)
Multiply equation 2 by 4/13:
{4 x + 3 y = 23 | (equation 1)
0 x+y = 1 | (equation 2)
Subtract 3 × (equation 2) from equation 1:
{4 x+0 y = 20 | (equation 1)
0 x+y = 1 | (equation 2)
Divide equation 1 by 4:
{x+0 y = 5 | (equation 1)
0 x+y = 1 | (equation 2)
Collect results:
Answer:  {x = 5                           y = 1
You might be interested in
HELP WITH THIS NOWW PLEASEEE
vichka [17]
The surface area of the cylinder is 301.44
3 0
2 years ago
Read 2 more answers
Twice the sum of four and x is three less than x.
aliya0001 [1]

Answer:

-11

Step-by-step explanation

Condition:

2(4+x)=x-3

8+2x=x-3

Combining similar terms

8+3=x-2x

11=-x

OR

x=-11

7 0
3 years ago
An octagonal pyramid ... how many faces does it have, how many vertices and how many edges? A triangular prism ... how many face
nadezda [96]

1: 8 faces and 9 with the base 9 vertices and 16 edges

2: 3 faces and 5 with the bases 6 vertices and 9 edges

3: 3 faces and 4 with the base 4 vertices and 6 edges

Hope this can help you.

4 0
3 years ago
How much is one melon if 3 sell for $1.98 ?
Sonbull [250]

Answer: $0.66


Step-by-step explanation: Just divide 3 / $1.98 and you will get $0.66.

Fairly simple, But the only thing I don't understand is why a melon is on sale for $0.66. Thats CHEAP! Give me 100 :)


8 0
2 years ago
Read 2 more answers
A retail store mailed out 350 shipments. 14% of the shipments arrived late.
nalin [4]

Answer:

49

Step-by-step explanation:

350 x 0.14 = 49

49 shipments arrived late.

Please rate!

Have a great day!

3 0
2 years ago
Other questions:
  • A cashier at a store has five dollars in $20 bills if there are six times as many five dollar bills as $20 bills and the total m
    6·1 answer
  • Mark all the statements that are true.
    14·1 answer
  • What is the derivative of 5cos^2(pi)(t)?
    15·1 answer
  • A sequence of transformations that maps (-4,2) to T'(-6,4) includes which transformations.
    5·1 answer
  • HELP WITH THIS QUESTION PLEASE AND THANK YOUU!!!
    13·1 answer
  • A number and its absolute value are equal. If you subtract two from the number, the new number and its absolute value are not eq
    13·1 answer
  • 52.7 × 12= ?<br><br>help again huhuhu​
    8·2 answers
  • Solve the equation b - 7 - 6 = 15 + 5b
    7·1 answer
  • Can someone plz plz plz help me choose an answer for this idk what it is
    15·1 answer
  • -3(v - 8) simplify expression do not solve answer after simplifying it
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!