Question 92091
 

Assume the linear equation is

c = ax +b

then using given information we get

10000 = 100a + b
22000 = 300a + b

solve this system:

using second equation minus the first one: 200a = 12000

so a = 60

From the first equation: b = 10000-100a

{{{b = 10000-100*a}}} = 10000 - 6000 = 4000

so we know a=60, b = 4000

the linear equation is 

c = 60x + 4000