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The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

Im gonna fail 7th grade selective breeding 1. creates offspring which are genetically identical to the parent 2. is the process of breeding only organisms with desirable traits 3. involves the removal of the nucleus of a cell 4. combines traits from organisms of different species

Ab and bc form a right angle at point b. if a= (-3,-1) and b= (4,4) what is the equation of bc?