Coombs’ reagent is an antiserum with antibodies that bind to human

Coombs reagent is an antiserum with antibodies that bind to the human antibodies attached on the surface of the erythrocytes.

Explanation:

Coombs test is a blood test used in immunology and immunohematology. It is of two types: direct and indirect.

The Coombs reagent is an antiserum, containing antibodies.

The direct Coombs test detects the antibodies present on the surface of the erythrocytes.

In this test, when the Coombs reagent is reacted with the blood to be tested, the antibodies in the Coombs reagent binds to the antibodies attached on the surface of the erythrocytes in the test blood and cause agglutination.

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)