The Arizona Supreme Court on Tuesday hears arguments in an appeal of a lower court's ruling that requires the state Legislature to give schools an annual funding increase even in lean years to account for inflation.

The high court is reviewing a Court of Appeals decision. It said a voter-approved law requires the Legislature to provide an annual inflation adjustment for state funding to public schools.

School districts and education groups sued after the Legislature in 2010 instead only increased schools' transportation funding, eliminating a $61 million increase in general school spending.

The Supreme Court says it is considering is whether the Voter Protection Act allows voters to require the legislature to increase funding for schools.

The Voter Protection Act severely restricts the Legislature's to change voter-approved laws.