Question

Which equation is represented on this graph?

Options:
A) t = −3n + 18
B) t = 3n − 18
C) t = 3n + 18
D) t = 3n − 2

Answer 1

simultaneous equation

Answer 2

y = -3x+18

Explanation:

We can find the slope using the formula

m = ( y2-y1)/(x2-x1) where *x1,y1) and (x2,y2) are two points on the line.

( 1,15) and (5,3) are two points on the line.

m = ( 3-15)/(5-1)

m = -12/4

= -3

The slope is negative.

Using the equation for a line.

y = mx+b

y = -3x+b

Substituting a point into the equation.

15 = -3(1) + b

18 = b

y = -3x+18