## Mrather Group Title 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 one year ago one year ago

1. sritama Group Title

B

2. incomplte Group Title

B

3. Callisto Group Title

Explanations?

4. sritama Group Title

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

5. kirbykirby Group Title

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

6. kirbykirby Group Title

They give you the point (0,1) which is |dw:1358396550543:dw| 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

7. kirbykirby Group Title

(And I guess you can assume the other points are valid for this equation since there is no option such as "none of the above")

8. kirbykirby Group Title

What sritama told you is perfectly valid as well, but perhaps a bit more time consuming