Neither. Changing the y-intercept will simply move the line up or down the y-axis.
The "steepness" is all a matter of the slope.
Now that we said that, we can think of a situation where changing the y-intercept
would change the slope of the line:
That would be where you were given the y-intercept and one other point, and you
have to find the slope, or find the equation, or draw the line.
If somebody sneaks in and changes the y-intercept, but leaves the other point right
where it is, then the slope of the line changes, (and so does the equation).
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less steep (apex)
The y-intercept is the point where the line crosses the y-axis. If you change the y-intercept, that means that the line crosses the y-axis somewhere else. Depending on what remains constant, you may get different results. For example, if you don't change the slope, the entire line will simply move up or down.
as the y-intercept increases, the graph of the line shifts up. as the y-intercept decreases, the graph of the line shifts down.
If the x intercept is a and the y intercept is b, then the equation of the line is bx + ay = ab
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