What is the most important subject in a celebration of grandfathers?

The most important subject in A Celebration of Grandfathers is sharing.

Explanation:

The author, Anaya, mentions several times how his people shared with each other, even during hard times. He also states how sharing was necessary in survival. The main idea of the essay is to share.

substitute y = 2x - 4 to x + 2y = 12:

x + 2(2x - 4) = 12     use distributive property

x + (2)(2x) + () = 12

x + 4x - 8 = 12     add 8 to both sides

5x = 20     divide both sides by 5

x = 4

put the value of x to the first equation:

y = 2(4) - 4

y = 8 - 4

y = 4