exam Maths Puzzle Numerical Ability

5x + 4y - z = 1
2x - 2y + z = 1
-x - y + z = 2

solve each system using substitution

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exam Other Question

tickets for homecoming dance cost $20 for a single ticket or $35 for a couple. ticket sales totaled $2280, and 128 people attende. how many tickets of each type were sold? Add thirty-eight and nine tenths, five and fifty-eight hundredths, seven, and fifteen and eight tenths.

OK I was wrong I have one more problem that I cannot grasp. Help please.