Question 134719
You are given a function with two variables in it X and Y. 

You are then given a value for one variable and asked to find solve for the other one.

1) X = 0 
{{{4x+3Y=12}}}
{{{4*0  + 3Y = 12 }}}
{{{ 3Y = 12}}}
{{{Y= 4}}}

2) Y=0
{{{4x+3Y=12}}}
{{{4x+3*0=12}}}
{{{4x = 12}}}
{{{ x = 3}}}

3) X= 4
{{{4x+3Y=12}}}
{{{4*4+3Y=12}}}
{{{ 16 + 3Y = 12}}}
{{{ 3Y = 12 - 16}}}
{{{ 3Y = -4 }}}
{{{ Y = -4/3}}}

Make sense?