Substitution
x-y=1
3x=3y+3

Step-by-step explanation:

3x/3=(3y+3y)/3

x=y+1

x=2

sum= when you add is how much the whole amount is

distance= when you use angles and it means how far it goes

step-by-step explanation:

fist on the left goes with the third on the right. second on the left goes with the fourth on the right. third on the left goes with the second on the right. the fourth on the left goes with first on the right