Find three consecutive integers whose sum is six times the greater integer

What should be done to solve the equation? x+14=21 add 14 to both sides of the equation. subtract 14 from the left side of the equation. add 14 to the left side and subtract 14 from the right side of the equation. subtract 14 from both sides of the equation.

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

What is the equation of this graphed line? enter your answer in slope-intercept form in the box.