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Yes, the line is proportional.

Step-by-step explanation:

As the graph is linear, when x increases, y will increase by an unchanging amount. In this case, when x increase by 1, y will always increase by 1.

ok

step-by-step explanation:

for this case we have by definition, if two lines are perpendicular, then the product of their slopes is -1.

then, given the following line:

so,

we are looking for m_ {2}:

then, the line is given by:

we find "b" replacing the given point:

finally, the equation is:

option c