The slope of line A is m= 1/3
Answer: 13.7
Step-by-step explanation: I used the pythagoream theorum.
At 9 weeks he would have enough money to buy the video console.
Let the unknown number be
.
Then the opposite of this unknown number will be
.
It is given to us in the question that when this unknown number,
is increased by 9, or in other words when 9 is added to this unknown number,
, then this becomes 5 times it's opposite, which is
.
Thus, from the given condition in the question, the equation we get is as:

We will solve this by isolating
as:



Thus the required number is -1.5