Linear function

Question

In a table, y is a linear function of x.

 

x      y

 

3      5

 

5     -3

 

7     -11

 

 

What is the value of y when x is 0?

Answer 1

slope, m = (y-5)/(x-3) = (5-(-3))/(3-5) = -4

Multiply by (x-3):

y-5 = -4(x-3) = -4x + 12

y = -4x + 17

At x = 0, y = 17.