Question

find the value of x for the given simultaneous equations
$x + 2y =19$; $x -y = 7$

1) 4
2) -11
3) 11
4) -4
​

Answer 1

Given : x + 2y = 19x - y = 7

To Find :   Value of x

1) 4

2) -11

3) 11

4) -4​

Solution:

x + 2y = 19     Eq1

x - y = 7         Eq 2

Eq1  + 2 * Eq2

=>  x + 2y  + 2(x - y)  = 19  + 2(7)

=> x + 2y  + 2x - 2y  = 19 + 14

=> 3x  =  33

=> x = 11

Value of  x = 11

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Answer 2

Given :

x + 2y = 19x - y = 7

To Find :

  Value of x

1) 4

2) -11

3) 11

4) -4

Solution:

x + 2y = 19     Eq1

x - y = 7         Eq 2

Eq1  + 2 * Eq2

=>  x + 2y  + 2(x - y)  = 19  + 2(7)

=> x + 2y  + 2x - 2y  = 19 + 14

=> 3x  =  33

=> x = 11

Value of  x = 11

Hope it helps ❤︎