Question

Solve the following simultaneous equation using substitution method :
x + y = 7
x - y= 5

Answer 1

Answer:

x+y=7

x-y=5. (1)

Step-by-step explanation:

1. x+y=7
2. y=7-x
3. now putting the value of y on quation (1)
4. x-y=5
5. x-(7-x) =5
6. x+x-7=5
7. 2x=5+7
8. 2x=12
9. x=12/2
10. x=6

Answer 2

Answer:

x = 6 and y = 1

Step-by-step explanation:

Substitution method :-

It is a method to solve equation by substituting one variable's value into other.

Solving :-

x + y = 7

It means,

x = 7 - y

Substituting value of x in other equation.

x - y = 5

( 7 - y ) - y = 5

7 - 2y = 5

2y = 2

y = 1

Putting value of y in any above two equation, we get x = 6.

x + y = 7

x + 1 = 7

x = 6

Answer :-

So, the value of x is 6 and value of y is 1.

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