3.071 X10^12. if you move the decimal place to the right 12 times it will end up behind the 3.
7x+5y=-24 (1)
4x+y=42 (2)
multiply equation (2) by 5 to get
20x+5y=210 (3)
then calculate (3)-(2) which gives you
13x=234 hence x=18
then substitute for x in either equation to get y=-30
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Answer:
8000,I think this is right answer
