Variables in algebra: finding intercepts, line equations

[paulxzt]

I'm having trouble with these problems, can anyone help. thanks in advance

1) Find the x-intercept(s):

3x^2 + 2y^2 + 4xy - 12 = 0

I'm not sure where to start.

2) Find the equation of the line that passes through point (2,-1) and is parallel to the line 2x + 7y = 5

I got down to y = -2/7x + 5/7 ? Do i just plug in the points? Im not sure

 

[pka]

Re: Variables in ALG

1) Find the x-intercept(s): 3x^2 + 2y^2 + 4xy - 12 = 0

Set y=0 and solve for x.

2) find the equation of the line that passes through point (2,-1) and is parallel to the line 2x+7y=5

Parallel lines have the same slope.
The slope of the given line is (-2/7).
Use the point-slope form.