Find the values of x and y which satisfy the following equations

Xy x xy if a and b are positive integers such that a*b=9 and b*a=72 what is the value of a/b

Simplify the algebraic expression 8y-2(y+4)

Task 1 four tangents are drawn from e to two concentric circles, a, b,c, and d are the points of tangency. name as many pairs of congruent triangles as possible and tell how you can show each pair is congruent.