Two points o the line are 3,1 and 1,-2 slope then equals (y1-y2)/(x1-x2) = (1- -2) / (3-1) = 3/2
y = 3/2 x + b find b by plugging in one of the points
1 = 3/2 (3) + b b = -7/2
so the line equation is y = 3/2 x - 7/2
The yellow shaded area is thus y> 3/2 x - 7/2 Multiply through by 2
2y > 3x - 7 re-arrange
2y - 3x + 7 >0