exam Maths Puzzle Numerical Ability

find log 1000 where log means log to the base of 10

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I need help solving these two seperate problems by using the substitution method. Can anybody help?
1. 1.25x+1.10y=1520

2. 1.10x+1.25y=1535

Please somebody help me! ORDER 0.4, 0.04, 4.00 AND 0.44 FROM LEAST TO GREATEST BY COMPARING NUMBERS TWO AT A TIME uSE GREATER OR LESSER TO COMPARE? EXPLAIN??