the function f is defined by f(x)=cx-3 where c is a constant. find c, if the value of f at x=1.5 is equal to -5.25
c (1.5) - 3 = -5.25 add 3 to both sides
1.5c = -2.25 divide both sides by 1.5
c = -1.5
thank you very much CPhill for the help