# GMAT 考满分题库

If ${2}^{x+y}$ = ${4}^{8}$, what is the value of y?

(1) ${x}^{2}$ = 81

(2) x − y = 2
• AStatement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
• BStatement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
• CBOTH statement TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
• DEACH statement ALONE is sufficient.
• EStatements (1) and (2) TOGETHER are NOT sufficient.

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