when you expand problems like these you need to multiple the number in front of the variable the the other numbers in front of the variables and add the exponents
like this
-4•11= -44 | 5+3=8 I -44x⁸
-4•2= -8 | 2+5=7 | -8x⁷
-4•9= -36 | 1+5=6 | -36x⁶
-4•1= -4 | 0+5=5 | -4x⁵
put it all together and you get -44x⁸–8x⁷–36x⁶–4x⁵
if my explanation is confusing I'm sorry feel free to ask questions
if the slope of the first problem is -2/7 then its perpendicular is 7/2 (the exact opposite) and since the y- intercept is the b in Y= mx +b the intercept of the equation you’re trying to find is -2
