We have the points (1,3) and (-1,4) passes through a line.
The equation for the line is:
y-y1 = m (x-x1) where m is the slope.
m= (y2-y1)/(x2-x1)
= (1/-2 = -1/2
y-3= (-1/2)(x-1)
y-3 = (-1/2)x + 1/2
y= (-1/2)x + 1/2 + 3
y= (-1/2)x + 7/2
Multiply by 2:
2y = -x + 7
x + 2y - 7 = 0