Question 168758
1.
4y=x+2 [I'll assume the second = should be a +] 
y=x/4+2/4
y=x/4+1/2 (red line)
2x+y=5
y=-2x+5 (green line)
{{{ graph( 300, 200, -6, 5, -10, 10, x/4 +1/2, -2x +5) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions x/4 +1/2 and -2x +5).
Ans.(2,1)
2.
4x+5y=1
5y=-4x+1
y=-4x/5+1/5 (red line)
3x-y=-4
-y=-3x-4
y=3x+4 (green line)
{{{ graph( 300, 200, -6, 5, -10, 10, -4x/5 +1/5, 3x +4) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions -4x/5 +1/5 and 3x +4). 
Ans. (-1,1)