Which pair of lines are perpendicular A. x-y=7 and y = x + 3
B. y = -4 + 1 and 8 x + 2y = -10
C. y = -8 and y = 2
D. x = 4 and y = - 1

step-by-step explanation:

ddd

answer

you start with $5 and save $10 a week until you have at least $45wer

step-by-step explanation:

step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.

you can use a^2+ b^2=c^2