Amanufacturing company builds construction machinery. it sells 10 machines for $18,100 and 20 machines for $26,600. which equation models the revenue, r(x), as a linear function of the number of machines built, x ?

select one:
a. r(x)=750x−10100
b. r(x)=450x+7200
c. r(x)=1200x−4500
d. r(x)=850x+9600