how can you find out wheter a line is perpendicular to y=-2.5x+13?

Question

texaschic101 · Answer

a perpendicular line will have the negative reciprocal of the slope in the above equation. The slope in the above equation is -2.5. The negative reciprocal of -2.5 is 1/2.5. To find the negative reciprocal, you just " flip " the fraction and change the sign. For example, the negative reciprocal of 3/2 is -2/3. 
Do you understand ?

jdoe0001 · Answer

a perpendicular line to THAT, will have a NEGATIVE RECIPROCAL slope

so the slope of that one is -2.5

RECIPROCAL of that
1/(-2.5)

NEGATIVE of that

-1/(-2.5)

anonymous · Answer

ohhhhhh yea thank u!

anonymous · Answer

would 2/5 be perpendicular to -2.5?

anonymous · Answer

nm

texaschic101 · Answer

no ...-2.5 is perpendicular to 1/2.5. Because -2.5 is the same as -2.5/1. Flip the fraction and change the sign.

anonymous · Answer

slope= $$\frac{ 1 }{ 2.5 }$$