Could you possibly be more specific?what math problem did they solve? i can help but just be a little more specific so i can answer your question
Numerical form is an actual number as opposed to a word.
"Seven" is not numerical form.
"7" is numerical form.
keeping in mind that perpendicular lines have negative reciprocal slopes, let's check for the slope of the equation above

well then therefore

so we're really looking for the equation of a line with slope of -1/3 and that passes through (1, -3 )
