How do you solve the system of equations #4x-y = -14# and #y = 4x+14# by substitution?
Solution: Infinitely many solutions
First of all substitution aka "replace" one variable with the given equation.
In this case, we replace the second equation for
#=> -14= -14#
This implied the system have infinitely many solutions , and it's consistent. In another word, when graph both equations , both line will overlapped each other at all points.
Further more, we can write this answer as follow