Question

solve by elimination 7 x + 9 Y is equal to 23 ,2x + 11 Y is equal to 15,find the value of p X + 9 Y is equal to 15

Answer 1

Answer:

x = 2, y = 1

p = 3

Step-by-step explanation:

check the attached photo

hope you get your answer

Answer 2

Answer:

Using Elimination method, we got the value of x=2,y=1 and p=3.

Given Data:

7x+9y = 23  

2x+11y = 15

Step 1:

Let the 1st equation 1 be 7x+9y = 23  

Let the 2nd equation be 2x+11y = 15

On solving the equation, multiply 1st equation with 2 and 2nd equation with 7.

So the equation will become

14x+18y = 46

14x+77y = 105 (After changing the sign in order to get the y value.)

Step 2:

14x+18y = 46

-14x-77y = -105

-------------------

-59y = -59y

y= $\frac{-59}{-59}$ = 1

Therefore y=1.

Step 3:

Substitute the y value in equation 1.

7x+9y=23

7x+9(1)=23

7x=23-9

x = \frac{14}{7} = 2

Step 4:

px + 9y=15

p(2)+9(1)=15

2P+9=15

2P=15-9

2P=6

P= $\frac{6}{2}$ =3