Solve by the elimination method.?

Question

4x + 7y = 23

9x - 7y = -62

What is the solution of the system? (Type an order pair. Type an interger or a fraction. Type N if there is no solution. Type I if there is an infinitely many solution.)

Answer 1

Here's a good explanation:

http://www.mathclues.com/MAdditionMethod...

Hope this helps you!  Please email for further clarification.

Answer 2

4x + 7y = 23

9x - 7y = -62

Add the equations together to eliminate the y terms.

13x = -39

x=-3

Substitute x=-3 into either of the original equations. I used the 1st.

4*-3 + 7y = 23

-12 + 7y =23

Solve for y

7y=35

y=5

(x,y)=(-3,5)

Answer 3

13 x = - 39

x = - 3

- 12 + 7y = 23

7y = 35

y = 5

x = - 3 , y = 5

Answer 4

4X + 7Y =23      (1)

9X - 7Y  = -62     (2)

now ADD

and you will get 13x =  -39 ( when i added i eliminated by canceling out the Y'S by each other)

so x= -3 NOW SUBSTITUTE THE VALUE OF X IN ONE OF THE ORIGINAL EQUATION

so 4X+7Y=23  (x=3)

So (4*-3) + 7X =23

-12 + 7Y =23

7Y= 23+12

7Y=35

Y=5

SO (-3,5)