Question

Which equation describes the four ordered pairs (-1,-3), (0,1), (2,9), (3,13)?

A. y=2x+1
B. y=4x+1
C. y=4x-1
D. y=2x-1

Answer 1

B

Answer 2

B

Answer 3

Explanations?

Answer 4

put the values of x and y in the equations and find in which case 4 of them are satisfying the equation.

Answer 5

Or there's a more systematic way of doing it:

Answer 6

They give you the point (0,1) which is your y-intercept in the formula y = mx+b, so b = 1

Now for the slope, take two points and calculate it using the slope formula:
If we take points (-1,-3) and (0,1):\[m=\frac{(-3)-(1)}{(-1)-(0)}= \frac{-4}{-1}=4\]

So, y = 4x+1