Question

What is the slope-intercept form of this equation?

3x + 9y = 18

A. y = -1/3x + 6

B. y = -1/3x + 2

C. y = 1/3x + 6

D. y = 2/3x + 2

Answer 1

Slope intercept for is y=mx+b

So to solve this, get y by itself, and move everything else to the other side of the equation.

3x + 9y = 18

first subtract 3x from each side

9y = 18 - 3x

Then divide each side by 9

y = $\frac{18-3x}{9}$

Simplify by dividing both 18 and -3 by 9

y = 2 - 1/3x

Rearrange it so that -1/3x comes first

y = -1/3x + 2

ANSWER:

B. y = -1/3x + 2

I hope this helps!

Answer 2

The correct answer is B. y = -1/3x + 2

Sorry if I am wrong, but I believe that this is the correct answer.