Forming the equation : 1 Mark
Steps : 1 Mark
Result : 1 Mark
According to question,
= (3x - y + 11) + (- y - 11) - (3x - y - 11)
= 3x - y + 11 - y - 11 - 3x + y + 11
= 3x - 3x - y - y + y + 11 - 11 + 11
= (3 - 3)x - (1 + 1 - 1)y + 11 + 11 -11
= 0x - y + 11
= -y +11