Hello from MrBillDoesMath!
Answer:
11
Discussion:
Solution by distance formula:
d = sqrt( (x2-x1)^2 + (y2-y1)^2)
= sqrt ( (-1 - (-1) )^2 + (4 - (-7))^2 )
= sqrt ( ( -1 + 1) ^2 + (4+7)^2)
= sqrt ( 0^2 + 11^ 2 )
= sqrt ( 11^2)
= 11
Solution by contemplation!
Note the x coordinate of both points is the same (i.e. -1) This means the line joining the points is vertical and its length is simply the difference of the y coordinates: 4 - (-7) = 4 + 7 = 11
Thank you,
MrB