Question about derivatives with regards to microeconomics.?

If utility function is expressed as U(x,y) = x^0.5 y^0.5 What is the marginal utility at point (64,25) and (49,36)? Treat Y as a constant. Would the answer be MUx(x,y) = y. MUx(64,25) = 5 ? and MUx(49,36) = 6?