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
Semmy [17]
4 years ago
5

Substitution Method x-y=9 x+y=7

Mathematics
2 answers:
marshall27 [118]4 years ago
5 0

Answer:

Step-by-step explanation:

Substitution method can be applied in four steps.

Solve one of the equations for either x = or y = .

Substitute the solution from step 1 into the other equation.

Solve this new equation.

Solve for the second variable. ...

Step 1: Solve one of the equations for either x = or y =

shutvik [7]4 years ago
5 0

Answer:

(8, - 1 )

Step-by-step explanation:

Given the 2 equations

x - y = 9 → (1)

x + y = 7 → (2)

Rearrange (1) expressing x in terms of y by adding y to both sides

x = 9 + y → (3)

Substitute x = 9 + y into (2)

9 + y + y = 7

9 + 2y = 7 ( subtract 9 from both sides )

2y = - 2 ( divide both sides by 2 )

y = - 1

Substitute y = - 1 into (3) for corresponding value of x

x = 9 - 1 = 8

Solution is (8, - 1 )

You might be interested in
Find the measure of c
guajiro [1.7K]

Answer:

B is the correct answer of this question

3 0
3 years ago
Krysta's soccer practice started at 7:45 A.M. on Saturday morning. The team practiced dribbling for 15 minutes and practiced sho
Furkat [3]

Total time used= 15+45+30=90 mins

Initial time=7:45

final time will be 1 hr 30 mins more than initial Time

final time= 9:15 am

6 0
2 years ago
A bag contains 36 marbles. 10 marbles are green, 6 marbles are blue, 18 marbles are yellow, and 2 marbles are purple.
alexdok [17]

Answer:

10/72 or 0.14

Step-by-step explanation:

There are 72 marbles in total and 10 of them are green. So, it is 10/72 or 1.388 rounded to the nearest hundredth is 0.14.

7 0
3 years ago
Iq scores are normally distributed with a mean of 100 and a standard deviation of 15 what is the probability that a randomly sel
a_sh-v [17]
So we are given the mean and the s.d.. The mean is 100 and the sd is 15 and we are trying the select a random person who has an I.Q. of over 126. So our first step is to use our z-score equation:

z = x - mean/s.d.

where x is our I.Q. we are looking for

So we plug in our numbers and we get:

126-100/15 = 1.73333

Next we look at our z-score table for our P-value and I got 0.9582

Since we are looking for a person who has an I.Q. higher than 126, we do 1 - P. So we get

1 - 0.9582 = 0.0418

Since they are asking for the probability, we multiply our P-value by 100, and we get 

0.0418 * 100 = 4.18%

And our answer is

4.18% that a randomly selected person has an I.Q. above 126
Hopes this helps!
6 0
3 years ago
NEED HELP WITH 7 AND 8<br> I WILL GOVE BRAINEST ONLY IF YOU ACTUALLY DO THE PROBLEMS
mihalych1998 [28]
7:
Parallel lines have the same slope
y = -3x + b
Plug in the x and y values from the point
5 = -3(-4) + b
5 = 12 + b
-7 = b
Answer to 7: y = -3x -7

8:
Perpendicular lines have opposite reciprocal slopes
y = -2x + b
Plug in x and y from the point
-6 = -2(7) + b
-6 = -14 + b
8 = b
Answer to 8: y = -2x + 8
3 0
3 years ago
Other questions:
  • Talia took the bus from her home to the bank and then walked back to her home along the same route. The round trip took 0.9 hour
    15·2 answers
  • Simplify 5(x - 6). -x 5x - 6 5x - 30
    9·1 answer
  • 34 +2B+C =-5 Then what is <br>12A +8b+ 4c =​
    12·1 answer
  • Mrs. Trujillo bought 400 shares of a company's stock for $42.98/share. She pays a broker a commission of $16 to buy and sell sto
    12·1 answer
  • Need help really bad
    8·1 answer
  • Is 2/3 cups. How many cups are in 5 servings?
    7·1 answer
  • Please helppp due in 10 minutesss!!!
    12·1 answer
  • © Gavin, Colin and Dan share some sweets in the ratio 4:5:3. Gavin gets 20 sweets. How
    14·1 answer
  • I think it might be barrel b
    14·2 answers
  • Factorize (x-3y)^3+27y^3<br> With explanation <br> Will mark Brainliest for the best one...
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!