The Effect Of Changing The Coefficent Of X In The Equation y=x

Today in class we learnt about what happens when you change the coefficent of x in the equation: y=x. Some important equations to learn are:
1. y=mx+b
2. y-y=m(x-x)
3. Ax+By+C= 0 ; m= -A/B; b= -c/B; Ax+By=C

I will later post the video since it wasn't working at this time.