What is the relationship between the lines determined by these two equations?

3x + 6y = 8
y = 2x – 8

parallel
***perpendicular
neither parallel nor perpendicular
they are the same line

Question

What is the relationship between the lines determined by these two equations?

3x + 6y = 8
y = 2x – 8 


       parallel
       ***perpendicular
       neither parallel nor perpendicular
       they are the same line

the_fizicx99 · Answer

Substitute and solve, then graph it.

3x + 6(2x – 8) = 8
3x + 12x - 48 = 8
15x - 48 = 8
       +48    +48

15x = 56
/15     /15

x = 3.73

.. So i can tell they're perpendicular