Question 311866
Determine if the equations are intersecting, parallel, or coincident.
2x-y=c
x+2y=d 
:
put both equations in the slope/intercept form y = mx + b
:
2x - y = c
-y = -2x + c
Multiply by -1
y = 2x - c
slope = 2
:
x + 2y = d
2y = -x + d
y = -{{{1/2}}}x + {{{d/2}}}
slope = {{{-1/2}}}
:
These slopes indicate the lines intersect and are perpendicular