Question

If FG = 2 units, FI = 7 units, and HI = 1 unit, what is GH?

Answer 1

Does the line look like this?

F________G_______H_______I

2+X+1=7
3+X =7
X = 4

Answer 2

we know that

`FI=FG+GH+HI`

solve for GH

`GH=FI-(FG+HI)`

we have

`FI=7\ units\\FG=2\ units\\HI=1\ units`

substitute in the formula above

`GH=7-(2+1)`

`GH=7-3`

`GH=4\ units`

therefore

the answer is

`GH=4\ units`