Question

(1, 5)(2, 8)(3, 11)(4, 14)(5, 17)(6, 20)(7, 23) A) y = 3x - 2 B) y = 3x + 2 C) y = -3x + 2 D) y = 1 3 x - 2 3

Answer 1

B) y = 3x + 2

Explanation:

Slope: (8 - 5)/(2 - 1)

= 3/1 = 3

y = 3x + c

5 = 3(1) + c

c = 5 - 3

c = 2

y = 3x + 2

Answer 2

y = 3x+2

Explanation:

First we need to find the slope

m = (y2-y1)/(x2-x1)

= (23-20)/(7-6)

=3/1

We know the slope is 3

Using the slope intercept form of a line

y= mx+b where is the slope and b is the y intercept

y = 3x+b

Using a point (1,5)

5 = 3(1)+b

Subtract 3 from each side

5-3= 3-3+b

2 = b

y = 3x+2