If a^x=b^y and a^y=b^x, show that x=y.

Can someone me out here number 4 plz

Questions 7-8. use the following table to answer. year 2006 2007 2008 2009 2010 2011 2012 2013 cpi 201.6 207.342 215.303 214.537 218.056 224.939 229.594 232.957 7. suppose you bought a house in 2006 for $120,000. use the table above to calculate the 2013 value adjusted for inflation. (round to the nearest whole number) 8. suppose you bought a house in 2013 for $90,000. use the table above to calculate the 2006 value adjusted for inflation. (round to the nearest whole number)

Two lines intersect and two of the vertical angles measure 115°. what is the measure of the other two vertical angles? 65° 85° 90° 245°