Question

Use the equation of the water level of the river represented by the equation y=-4x + 170, where x represents the

number of years and y represents the total feet. What points are located on the line?
Check all that apply.
(170,0)
(0,170)
(12, 126)
(50,30)
(5, 150)
(60,-70)
​

Answer 1

(0,170) and (60,-70) and (5, 150)

Explanation:

Answer 2

(0,170) and (60,-70) and (5, 150)

Explanation:

To see if a given point is on the line or not, you just have to enter the x value (first value in the parenthesis) and see if the function returns the correct y value (second number in the parenthesis).

f(x) = -4x + 170

(170,0) => -4 (170) + 170 = -680 + 170 = 510. NO, not equal to 0.

(0,170) => -4 (0) + 170 = 0 + 170 = 170. YES

(12, 126) => -4 (12) + 170= -48 + 170= 122. No, not equal to 126.

(50,30) => -4(50) + 170 = -200 + 170 = 130. No, not equal to 30.

(5, 150) => -4(5) + 170 = -20 + 170 = 150. YES

(60,-70) => -4(60) + 170 = -240 + 170 = -70. YES