Upper and lower bounds of interval

Alyssa's program is incomplete because she has not specified the implementation of the interval abstraction. Here is a definition of the interval constructor:

(define (make-interval a b) (cons a b))

Define selectors upper-bound and lower-bound to complete the implementation.

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(define (make-interval a b)
  (cons a b))

(define lower 5)

(define upper 10)

(define interval (make-interval lower upper))

(check-equal? (lower-bound interval) lower)
(check-equal? (upper-bound interval) upper)