Answer:
[tex]\Huge \boxed{5x - 19}[/tex]
[tex]\rule[225]{225}{2}[/tex]
Step-by-step explanation:
A ——— B ——— C
AC = 8x - 20
AB = 3x - 1
BC = AC - AB
BC = (8x - 20) - (3x - 1)
Distributing negative sign.
BC = 8x - 20 - 3x + 1
Combining like terms.
BC = 5x - 19
[tex]\rule[225]{225}{2}[/tex]