Answer:
y = - x + 7
Explanation:
the equation of a line in slope- intercept form is
y = mx + c ( m is the slope and c the y- intercept )
given slope m = - 1 , then
y = - x + c ← is the partial equation
to find c, substitute (- 6, 13 ) for x and y in the partial equation
13 = - (- 6) + c = 6 + c ( subtract 6 from both sides )
7 = c
y = - x + 7 ← equation of line