2x - y = 10
x - y = 6​

x = 4

y = -2

Step-by-step explanation:

Rearrange the equations so that they are in terms of x.

y = 2x - 10

y = x - 6

⇒ y = y

Hence:

2x - 10 = x - 6

Rearrange

2x - x = -6 + 10

Simplify

x = 4 (substitute this value into any equation)

y = 4 - 6

y = -2

where are the choices?

6mm^3 or .6cm^3

      216

      /   \

  36     6

  /   \     /

6     6   6

factor trees are nice.