Equate the line that passes through the point M (-1; 9) and is parallel to the line y = -7x = 3.

To begin with, we immediately note that if the straight lines are parallel, then their slopes are equal:

k1 = k2 = -7.

y = -7 * x + b is the equation of the desired straight line.

Now it is enough just to substitute the values of the coordinates of the point belonging to the graph of the linear function, after which we get the equation of the straight line:

9 = -7 * (-1) + b;

b = 9 – 7 = 2;

y = 2 – 7 * x – the equation of our line.