Question

Find the value of a so that the function has the given value
k(x)=6x-12; k(x)=18

Answer 1

k(x)=6x-12

k(x)=18

Substitute

6x-12=18 /+12

6x=30 /:6

x=5

Answer 2

so we substitute in K(x) into the equation K(x)=6x-12

which gets us: 18=6x-12

6x=30

x=5