a) x + y +xy = 6
y( 1 + x ) + x + 1 = 7
( x + 1 ) ( y + 1 ) = 7
x+1 | -7 | -1 | 1 | 7 |
y+1 | -1 | -7 | 7 | 1 |
x | -8 | -2 | 0 | 6 |
y | -2 | -8 | 6 | 0 |
b) 2x + y - 2xy - 8 = 0
2x ( 1 - y ) - ( 1 - y ) - 7 = 0
( 1 - y ) ( 2x - 1 ) = 7
2x - 1 | -7 | -1 | 1 | 7 |
1 - y | -1 | -7 | 7 | 1 |
x | -3 | 0 | 1 | 4 |
y | 2 | 8 | -6 | 0 |
c) x - 4y + xy - 1 = 0
x( 1 + y ) -4( 1 + y ) + 3 = 0
( 1 + y ) ( x- 4 ) = 3
x- 4 | -3 | -1 | 1 | 3 |
1 + y | -1 | -3 | 3 | 1 |
x | 1 | 3 | 5 | 7 |
y | -2 | -4 | 2 | 0 |