Answer: You start to ascend
Explanation:
Since you are walking due south and the positive y-axis points north, the y-coordinate decreases.
Let

= y-coordinate after walking due south

= z-coordinate (or the height) after walking due south
So, the point where you stand after walking due south has a coordinate of

. Moreover,

Since the y-coordinate decreases after walking due south and

,

So, the height after walking due south exceeds 1,206 meters, which is the previous height before walking due south. Therefore, if you walk due south from point with coordinates (100, 120, 1206), you are ascending.
Parallel means their slopes should equal to each other.
Thus we need to find the slope of the given line ,
Let's do it.....

Subtract sides -3x


Divided sides by -4


This is the slope-intercept of the line.
We know that the coefficient of the x in slope-intercept form , is the slope of the line.
Thus the slope of the equation which we want is :

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We have following equation to find the point-slope form of the linear functions.

Now just need to put the slope and the given point in the above equation.

Multiply sides by 4


Plus sides 24


Subtract sides -3x


And we're done....♥️♥️♥️♥️♥️