8. It used to be standard to leave a tip of 15% on the total of a bill that you get at a restaurant. This is more challenging than a 10% or 20% tip but can still be done using our 10% shortcut.
Find the tip you should leave on each of these totals. Show your calculations.
(a) Total bill of $40.00
(b) Total bill of $68.00

hey! so 1 (25) out of 4 (100) is 25 so your answer is 25%. it's like quarters!

a

step-by-step explanation:

b

step-by-step explanation:

the equation of a line in point- slope form is

y - b = m(x - a)

where m is the slope and (a, b) a point on the line

calculate m using the slope formula

m = (y₂ - y₁ ) / (x₂ - x₁ )

with (x₁, y₁ ) = (0, 4) and (x₂, y₂ ) = (3, - 5) ← 2 points on the line

m = = = - 3

with m = - 3 and (a, b) = (3, - 5), then

y - (- 5) = - 3(x - 3), that is

y + 5 = - 3(x - 3) → b