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The difference between the first number and two times the second

The difference between the first number and two times the second
    number is -54, while the sum of three times the first number plus
    twice the second is 94. What is the first number?

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Francisco E. | Francisco; Civil Engineering, Math., Science, Spanish, Computers.Francisco; Civil Engineering, Math., Sci...
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The two equations to be solved are:
x= first number
y= second number
x-2y=-54
3x+2y=94
adding them up we obtain:
4x = 40
x = 10
then we get that y = 32
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