Two lines are parallel if they hay the same slope.
The slope, m, of the line that passes through the points (x1, y1) and (x2, y2) is computed as follows:
From the graph, line m passes through the points (0, 1) and (3,3), then its slope is:
Equation of a line in slope-intercept form
where m is the slope and (x1, y2) is a point on the line.
The new line has to pass through point P(1, -2). Substituting with this point and m = 2/3 into the general formula: