book Maths Puzzle Numerical Ability

Solve the following system.
1st by Addition
2nd by Substitution
0.2x + 0.37y = 0.8
-0.6x + 1.4y = 2.62

I am getting confused with addition and the substitution. I have three

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book Other Question
Seattle Star blends whole bean coffee worth $0.93 per pound with half bean coffee worth $1.20 per pound to get 30 pounds of a coffee blend worth $1.02 per pound. How many pounds of each type of coffee does she use? n2 -8n +14 = 0