Question 377029
x-4y=-7   
2x-8y=-4
 
there is line2 equals line1 times 2 on the left handside, but not on the right, hence has no solution : line2-2line1 = 0=1 impossible
  
or
 
*[invoke linear "x", "y", 1, -4, -7, 2, -8, -4 ]