Explanation:
I guess the result is needed again in slope-intercept form.
this is in general
y = ax + b
"a" being the slope, "b" being the y-intercept (y value when x = 0).
when a line is parallel to another line, this means they both have the same slope.
so, we can use the same "a" from the original line : -1
to get "b" we use the given point coordinates :
5 = -1×-3 + b = 3 + b
2 = b
so, the full equation is
y = -x + 2