Does the point (4,2) satisfy the equation y = x

No,

y=x means the y part of the co-ordinate must be the same as the x part of the co-ordinate

So (4,4) and (2,2) would work but NOT (4,2)

step-by-step explanation:

the multiplicative inverse of a fraction a/b is b/a. for the multiplicative inverse of a real number, divide 1 by the number. for example, the reciprocal of 5 is one fifth 1/5 or 0.2, and the reciprocal of 0.25 is 1 divided by 0.25, or 4.