Question

 (-18)=-6, What is the value

Answer 1

Step-by-step explanation:

(-18)=(-6)

=(-6)/18

=(-2)/6

=(-3)

hope it helps

Answer 2

Answer:

(1) x - y = 5 --> x=y+5x=y+5 --> xy=(y+5)y=−6xy=(y+5)y=−6 --> y2+5y+6=0y2+5y+6=0 --> y=−3y=−3 or y=−2y=−2. If y=−3y=−3 then x=y+5=2x=y+5=2 so xy(x+y)=−6(x+y)=6xy(x+y)=−6(x+y)=6. But if y=−2y=−2 then x=y+5=3x=y+5=3 so xy(x+y)=−6(x+y)=−6xy(x+y)=−6(x+y)=−6. Two different answers, hence not sufficient.

(2) xy^2 = 18 --> xy∗y=−6∗y=18xy∗y=−6∗y=18 --> y=−3y=−3 --> x=2x=2 --> xy(x+y)=−6(x+y)=6xy(x+y)=−6(x+y)=6. Sufficient.

Step-by-step explanation :