Question 205483
3x+ 2y =5
2y=-3x+5
y=-3x/2+5/2
y=-3x/2+2.5
{{{ graph( 300, 200, -6, 5, -10, 10, -3x/2 +2.5) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, -3x/2 +2.5). 
(k,4)
3k+2*4=5
3k+8=5
3k=5-8
3k=-3
k=-3/3
k=-1 ans. (-1,4)
Proof:
3*-1+2*4=5
-3+8=5
5=5