Respuesta :
Answer:
Step-by-step explanation:
The given system of simultaneous equations is expressed as
-5=x-3y
11=-3x+7y
Rearranging both equations, it becomes
x - 3y = - 5- - - - - - - - - - 1
- 3x + 7y = 11 - - - - - - - - - -2
Multiplying equation 1 by 3 and equation 2 by1, it becomes
3x - 9y = - 15 - - - - - - - - - - -3
- 3x + 7y = 11 - - - - - - - - - - - 4
Adding equation 3 to equation 4, it becomes
- 2y = - 4
Dividing the left hand side and the right hand side of the equation by
- 2, it becomes
- 2y/ - 2 = - 4y/- 2
y = 2
Substituting y = 2 into equation 1, it becomes
x - 3 × 2= - 5
x - 6 = - 5
Adding 6 to left hand side and the right hand side of the equation, it becomes
x - 6 + 6= - 5 + 6
x = 1
