A mixture contains 21.7 g NaCl,
3.74 g KCl, and 9.76 g LICI.
How many total moles are in this
mixture?

answer: (c) m∠qpo + (2x + 16)° = 180°

step-by-step explanation:

the opposite angles of a quadrilateral are supplementary.

so, ∠o + ∠q = 180°   and   ∠p + ∠r = 180°

since ∠r = 2x + 16°, we can use substitution as follows:

∠p + ∠r = 180°

∠p + (2x + 16)° = 180°

thats not a system of equations, that is a solution