Question 199266
2x + y=7
y=-2x+7 (red line)
4x(-)2y=5
-2y=-4x+5
y=-4x/-2+5/-2
y=2x-2.5 (green line)
{{{ graph( 300, 200, -6, 5, -10, 10, -2x +7, 2x -2.5) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions -2x +7 and 2x -2.5). 
y=-2x+7
y=2x-2.5
-2x+7=2x-2.5
-4x=-7-2.5
-4x=-9.5
x=-9.5/-4=2.375 ans. for the x value.
y=-2*2.375+7
y=-2.25 ans. for the y value.