What postulate or theorem proves the two triangles are similar?

If y varies directly as x2 and y=6 when x=6, find the constant of variation.

Type the correct answer in the box. consider the system of linear equations below. rewrite one of the two equations above in the form ax + by = c, where a, b, and c are constants, so that the sum of the new equation and the unchanged equation from the original system results in an equation in one variable.

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?