Recall the logarithm rules :
a^y = x is the same as log_a x = y
In this case,
a = 18
y = r - 10
x = 93
So,
18^ (r-10) = 93
is the same as
log_18 93 = r - 10
Solve for r to get :
10 + log_18 93 = r
the answer should be 17/3
The equation is y = -3/2
this is because the line crosses zero on the Y axis so there is no Y intercept
and to get the slope you just see how many units down & then right you need to get from the center point to the one more down
12k-6+12k (expand the brackets first)
24k-6 (collect like terms)
Final answer is 24k-6
