Question

Solve the simultaneous equations 4 x + y = 20 x − y = 10

Answer 1

Answer:

x=6 , y= -4

Step-by-step explanation:

4x+y=20.........         in {i}

x-10=y........substitute in {i}

we get

4x+x-10=20

5x=30

x=6

6-10=y

-4=y

hope this helps!!!

Answer 2

Answer :

x = 6 , y = -4

Solution :

Here ,

The given equations are ;

4x + y = 20 ----------(1)

x - y = 10 -----------(2)

Now ,

Adding eq-(1) and (2) , we get ;

=> 4x + y + x - y = 20 + 10

=> 5x = 30

=> x = 30/5

=> x = 6

Now ,

Putting x = 6 in the eq-(2) , we get ;

=> x - y = 10

=> 6 - y = 10

=> - y = 10 - 6

=> - y = 4

=> y = -4

Hence ,

x = 6 , y = -4