Question

Put the equation in slope-intercept form and identify the slope of the line. 3x + 9y = 12

Answer 1

y=mx+b
arrange it in this form

Answer 2

9y=-3x+12
y=-3/9x +12/9

Answer 3

slope intercept form : y = mx + b

step 1 -- subtract 3x from both sides
step 2 -- divide both sides by 9
step 3 -- reduce
the slope will be in the m position

Answer 4

See, that's what I don't understand. My teacher has not explained what exactly it means to do something "on both sides."

Answer 5

Subract 3 from both sides means
3x + 9y = 12
-3 -3

Answer 6

So it's 3x - 3 and 12 - 3