does the point (9, -8) satisfy the equation y = x - -1?
we have
x=9
y=-8
substitute in the given equation
y=x- -1-------> y=x+1
-8=9+1
-8=`10 -----> is not true
therefore
Not satisfy the equation
Part 2
is (76,67) a solution to the equation y = x + -9
we have
y = x + -9 -------> y=x-9
x=76 and y=67
substitute
67=76-9
67=67 -----> is true
therefore
Yes, its a solution