Question

One of the lines has a positive slope, one has a negative slope. Which one do you think has a Negative Slope?

Answer 1

The line thas has a negative slope is the blue one.

Remember that the slope gives the change rate between y and x, that is, the slope is defined by

`m=(\Delta y)/(\Delta x)`

This means that for every

`\Delta x`

we move to the right, then we move the ammount

`\Delta y`

in the y direction. Therefore the sign of the slope tell us if we move down (if the slope is negative) or up (if the slope is postive) while we move to the right.