Answer:
Explanation:
You are given three symbolic equations and one expression to evaluate using those symbols.
Equations
The equations can be written in standard form as ...
7□ - 4∆ +12★ = 98
11□ +3∆ = 208
12□ = 168
Solution
These can be solved from the bottom up:
□ = 168/12 = 14
∆ = (208 -11·14)/3 = 54/3 = 18
★ = (98 -7·14 +4·18)/12 = 72/12 = 6
Expression
The expression can be written using these symbol values. It becomes ...
6·(18 +6 -14) +14·(6 +18/18) =
6·(10) +14·(7) =
60 +98 =
158 =