I have to graph the line using this equation; 3x+2y=-4 PLEASE HELP? =)

Question

anonymous · Answer

First of all, solve for y.

y=???

phi · Answer

You could try to find 2 points that are on the line.  Then plot the 2 points  and draw a line through the points  (connect the dots...)

one way to find 2 points is replace x with some nice easy number and solve for y

for example, if x is -1  you would do this
 3x+2y=-4
3 * -1 + 2y = -4  (we replaced x with -1)

that simplifies to
-3 + 2y = -4
add +3 to both sides
-3+3 + 2y = -4 + 3

simplify some more:
2y = -1
divide both sides by 2
y = -1/2

that means that (-1, -1/2) is on the line

now find another point.  Try using x=0 and solve for y

anonymous · Answer

(-4/3, 0) , ( 0,-2) i think these are my two points soemtimes i get it sometimes i don't i think my main issue is how after i submitted my answer for another problem  the explanation they gave me went from 4x+3y+6 =0 to 3y=-4x-6 to y=4/3x -2 and i don't understand how they were working it out

phi · Answer

yes, re-writing the equation in the form $$ y= \frac{4}{3}x -2 $$ is a good way. This tells you the slope is 4/3 (up 4 and over three) You use algebra to "solve for y" It might be easiest to explain if you look at this http://www.khanacademy.org/math/algebra/linear-equations-and-inequalitie/equation-of-a-line/v/converting-to-slope-intercept-form

anonymous · Answer

ohh yeahh i used to use knan i forgot about that site, thanks =)