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
nataly862011 [7]
3 years ago
10

Substitute this equation x+3y=18 & -x-4y=-25

Mathematics
1 answer:
sveticcg [70]3 years ago
5 0

Answer:

 {x,y} = {3/7,-43/7}

Step-by-step explanation:

System of Linear Equations entered :

  [1]    x + 3y = -18

  [2]    -x + 4y = -25

Graphic Representation of the Equations :

   3y + x = -18        4y - x = -25  

 

 

Solve by Substitution :

// Solve equation [1] for the variable  x  

 

 [1]    x = -3y - 18

// Plug this in for variable  x  in equation [2]

  [2]    -(-3y-18) + 4y = -25

  [2]    7y = -43

// Solve equation [2] for the variable  y  

  [2]    7y = - 43  

  [2]    y = - 43/7  

// By now we know this much :

   x = -3y-18

   y = -43/7

// Use the  y  value to solve for  x  

   x = -3(-43/7)-18 = 3/7  

Solution :

{x,y} = {3/7,-43/7}

You might be interested in
What is 4× 10 in standard notation
riadik2000 [5.3K]
400000 10 to the fifth power is 100000, so when you switch out the 1 for a 4, it become 400000.
6 0
3 years ago
Need urgent help with this math
mash [69]

Answer:

i need points so i am answering

Step-by-step explanation:

6 0
2 years ago
Which graph represents this equation?<br> y = 1/2x^2 + 2x - 6
s2008m [1.1K]

Answer:

C

Step-by-step explanation:

y = 1/2x^2 + 2x - 6

When, x = 0, y = - 6

you don't need to find another variable. Because in number C u can find a graph that has y= -6 when x =0.

6 0
3 years ago
A radiator contains 10 quarts of fluid, 30% of which is antifreeze. How much fluid should be drained and replaced with pure anti
babymother [125]

Answer:

1 3/7 quarts should be drained off and replaced with pure antifreeze.

1 3/7 ≈ 1.4286

Current amount of antifreeze in quarts is -

30/ 100 × 10 = 3

40% ---> 4 quarts

Let the amount drained of and replaced with antifreeze be x-

The amount left after draining off is 10 − x.

The amount of antifreeze  is 30/ 100 (10−x).

30/100(10-x)+x=4

3-3/10x+x=4

3+x(1-3/10)=4

x=1*10/7=1 3/7 quarts

check;

10- 1 3/7 = 8 4/7

=(30/100*8 4/7)+1 3/7

=(3/10 * 60/7) + 10/7

=3*6/7 + 10/7

=28/7

=4

4 liters of pure antifreeze is mixed into 10 quarts.

8 0
3 years ago
A field is 3645 feet long.<br><br> What is the length of the field in yards?
Ilya [14]

Answer:

answer of this question is 12150

8 0
2 years ago
Other questions:
  • louis drives for 5 and a half miles at an average rate of 65 miles per hour. how many miles does he drive
    7·1 answer
  • Solve a = a+b+c+d/4 for c
    8·1 answer
  • If you have 9 people and you want to share a turkey, how much turkeys will you need?
    11·1 answer
  • keisha drove 225 miles using 10 gallons of gas. at this rate, how many gallons of gas would she need to drive 441 miles
    12·1 answer
  • Find an integer, x, such that 2, 4, and x represent the lengths of the sides of an obtuse triangle.
    7·1 answer
  • Please help me solve!-
    12·1 answer
  • 1. The following system has NO SOLUTION. Explain with specific values why the system has no solutions.
    9·2 answers
  • Is this statement true or false?
    5·1 answer
  • Complete the following statement of congruence:<br> A. TRS<br> B. RTS<br> C. STR<br> D. RST
    14·1 answer
  • PLEASE HELP ASAP!!! PLEASE ALSO GIVE EXPLANATION WITH EQUATION AND WORDS!!
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!