Are eye and away a slant rhyme?

No, "eye" and "away" do not form a slant rhyme. A slant rhyme is a type of rhyme in which the last音が similar but not identical. While the final sounds of "eye" and "away" both end with the "ay" sound, the "i" sound in "eye" is voiced, while the "a" sound in "away" is unvoiced.