0.01x - 0.3y = 1 y = 0.1x - 2 which of the following systems is equivalent to the given system?

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0.01x - 0.3y = 1           if multiplied by 100, this appears without fractions as
                                    x - 30y  = 100, or x = 30y + 100
      
y = 0.1x - 2,              if mult. by 10, becomes  10y = x - 20

If you want to go a step or two further and solve this, subst.  x = 30y + 100 into the 2nd equation:          10y = (30y + 100) - 20
                                            -20y = 80, and y = -4.  

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