Question #19e0b

1 Answer
Jan 22, 2018

a = 3

Explanation:

x + y = 2
=> y = -x + 2

Comparing the above equation by y = mx + c we get,

slope = m = -1

Now, here, slope of the line by 2 points is given by,

m = (y_2 - y_1)/(x_2 - x_1)

As I stated earlier,
If the slope of the lines are equal, then the line are parallel or coincident

:. (a + 1)/(-3 -1) = -1

The value a comes out to be as a = 3

HOPE THIS HELPS