Question

You start out with $20 and then spend money in a store where every item is $3. Y = -3x + 20. What is the slope of this problem?

Answer 1

Y = -3x + 20
=20-3x

20=money we have originally
Y=money left
3=cost of item
x= no. of item we buy
therefore, slope = -3 which moeny spent on 1 item

Answer 2

If that was the slop can you tell me the y intercept?

Answer 3

put x=0, we can find y-intercept which is 20
20 is the money we have originally

Answer 4

Memorize the linear formula:
y = mx + b ( m is slope, b is y intercept)
Match them:
Y = -3x + 20

Answer 5

@gageallen15 Of course CoCoTsoi's explanation is far better than mine, since it implies real concept.
Just try to show you the shortcut in case :P

Answer 6

Thank you :)