You can use substitution or elimination or graphing to solve the equation. Since both of the equations are in slope intercept form it will be easier to use substitution or to graph it and find the point of interception.
164.35
100 + 60 + 4 point 30 +5 = 164.35
i hope this help
As shown on the graph the 2 points mentioned have the following coordinates:
A(7,19) & B(11,11), That is A(x₁,y₁) & B(x₂,y₂)
the rate of change between A & B is the slope that is equal to:
slope = rate of change = (y₂-y₁) / (x₂-x₁) ==>(11-19) / (11-7) = (-8) / (4)
Rate of change = -2