Question

y=x+4 (-7,1)

Answer 1

Well I suppose all you need to do is plug the c and y into the equation

remember a coordinate is (x,y)

so -7 would be your x and 1 would be y

So

y =x + 4

1 = -7 + 4

1 = -3

I'm not sure what the question is...but if it's something like "Does this point exist on the line y=x + 4...then the answer is no