The function f(x) = 40x + 8 represents the amount of money makayla earns reupholstering furniture. the function g(x) = 3x − 4 represents her upfront costs. find (f – g)(4) to determine how much profit she will make from four pieces of furniture.

$168
$21
$160
$8

b

a

step-by-step explanation:

given the 2 equations

- x + y = - 2 → (1)

2x - 3y = 4 → (2)

multiplying (1) by 2 and adding to (2) will eliminate the x- term

- 2x + 2y = - 4 → (3)

add (2) and (3) term by term

(2x - 2x) + (- 3y + 2y) = (4 - 4), simplifying gives

- y = 0 ⇒ y = 0

substitute y = 0 in either of the 2 equations for corresponding value of x

substituting in (2) gives

2x = 4 ( divide both sides by 2 )

x = 2

solution is (2, 0 ) → a

the first is 13 the second is 1 the third is 8 and the fourth is 7

the answers are

1. 2

2. 5

3. symmetrical