Solve the simultaneous equation
y+x=4
2y-x=5

Solution,

Using substitution method,

y + x = 4

Move 'x' to the left hand side and change its sign:

y = 4 - x > equation (i)

Now,

2y - X = 5

putting the value of y from equation (i)

2( 4 - x ) - X = 5

8 - 2x - x = 5

8 - 3x = 5

- 3x = 5 - 8

- 3x = - 3

The difference sign (-) will be cancelled in both sides

3x = 3

3x/3 = 3/3

X = 1

Value of X is 1

Now, replacing the value of X in equation (i)

y = 4 - x

= 4 - 1

= 3

Value of y is 3

Hope this helps...

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