Systems of equations - elimination method
2x-y=17 x-y=10

The human body is organized at different levels, starting with the cell. Cells are organized into tissues, and tissues form organs. Organs are organized into organ systems such as the skeletal and muscular systems

2x - y = 17
-(x - y = 10)

x = 7

7 - y = 10
y = -3

(7,-3)