Answer:
x-coordinate is 3
Explanation:
Q has y-coordinate of -4 => the distance from origin to y-coordinate is 4 units, which is one leg of the right triangle
Pythagorean theorem states that the sum of the squares on the legs of a right triangle is equal to the square on the hypotenuse.
c^2 = a^2 + b^2
with c = 5, a = 4
5^2 = 4^2 + b^2
b^2 = 25 - 16 = 9
b = √9 = 3
so Q has coordinates (3,-4)