Answer
The slope will still be negative, but less steep.
Work Step by Step
Slope of the line $y=mx+b$ is defined as
$m=\displaystyle \frac{\Delta y}{\Delta x} =\displaystyle \frac{Rise}{Run}$,
Currently, x increases by 2 units (from 1 to 3),
and y decreases by 3 units (from 2 to -1).
So, $\displaystyle \quad m=\frac{-3}{2}, \quad$ the slope is negative.
Increasing the number in cell A3, the $\Delta x$ will be greater than 2, while $\Delta y$ remains $-3.$
So, the slope will still be negative, but less steep.
