Question

solve 3x+4y=12

Answer 1

If you have two unknowns you need two equations to solve the unknowns.

Answer 2

3x + 4y = 12
convert into slope y-intercept form:
y = -3/4 x + 4

slope: -3/4

y-intercept: 4

x-intercept:
0 = -3/4 x + 4
3/4 x = 4
x = 16/3

the line has a slope of -3/4 and passing through the points (0,4) and (16/3, 0)

Answer 3

I guess you don't need another equation to work on the problem
http://www.wolframalpha.com/share/clip?f=d41d8cd98f00b204e9800998ecf8427e4qb42vj1uu

Answer 4

nincompoop - but you haven't solved for x and y (you need another equation for that). When I see the word "solve", I think it means solve for for the unknowns.
It seems gby1 wasn't very descriptive with that question.

Answer 5

@Wolf is right, the question is not descriptive enough.

What nincompoop found is where the function intersects with the axes, but those are not the definite solutions for x and y.

If the question was to solve for a variable it would look like this:

Solve for x:
x=(12-4y)/3


Solve for y:
y=(12-3x)/4

Answer 6

3x+4y=12
x/4+4/3=1
x=4, y=0
x=3,y=1/3
x=2, y=3/2
x=1, y=9/2
x=0, y=3