drastipatel18
30.01.2020 •
Mathematics
Hershey's 6-oz milk chocolate almond bar contains 25 milligrams of caffeine. a 20-oz bottle of coca-cola has 32 more milligrams of caffeine than the hershey bar. how many milligrams of caffeine does the 20-oz bottle of coca-cola have?
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Ответ:
Ответ:
x=8 and y= -3
Step-by-step explanation:
2x + 7y= -5. eqn 1 ×6
-x -6y = 10. eqn 2 ×7
12x + 42y = -30
+
-7x - 42y = 70
= 5x= 40
x= 8
to find y
substitute x into eqn 2
-8-6y=10
-6y=10+8
-6y=18
therefore 6=-3