The lines given by the equations y = 9 − 1 3 x and y = mx + b are perpendicular and intersect at a point on the x-axis. What is the value of b?

Which is the most efficient first step to solve x in the equation 3.7x - 18 = -4.3x -34 a. add 3.7x to both sides of the equation. b. add 4.3x to both sides of the equation. c. subtract 18 from both sides of the equation. d. subtract 34 from both sides of the equation.

Pls , the question is in the picture!

How to find the exponential function y=ca^x, with points (1,2) and (2,1)