First isolate y by adding x to both sides in y-x=3 and getting y=x+3 Step 1: substitute x+3 for y in 3y=x+6 to get 3(x+3)=x+6 Step 2: distribute 3x+9=x+6 Step 3: subtract like terms 2x=-3 Step 4: divide x=-3/2
substitute -3/2 for x in y=x+3 to get y=-3/2+3 y=3/2
68% of the data falls within one standard deviation, 95% percent within two standard deviations, and 99.7% within three standard deviations from the mean.
