Explanation:
From second equation
3y = 19 - x multiply it by 3
9y = 57 - 3x Use this value of '9y ' in the first equation (substitution)
9x + (57-3x) = 9 solve for x
6x = -48
x = -8 use this value of 'x' in any of the equations to calculate the 'y'
x + 3y = 19
- 8 + 3y = 19
3y = 27
y = 9
(-8,9)