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Question 14 of 20
Consider the function y = -2 -3 cos(x + 7). What effect does the -2 have on the
basic graph?
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A. Vertical shift down 2 units
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B. Horizontal shift right 2 units
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C. Vertical stretch by factor 2
D. Horizontal shift left 2 units
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SUBMIT
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2

If you divide 0.1 and 0.6 you wii get 0.166666 which rounds to .167 which is answer b

So the first thing we do is to multiply the top equation by 3. the reason i want to do this is i notice there will be a 6y on both equations and can possibly add/subtract them. so we get 6y = -3x + 27. adding that and the second equation we get 6x = 27-15 which is 12. divide by 6 and we get 2. ∴ x = 2. substituting 2 into the first equation we get 2y = -2 + 9 which is 7. divide by 2 and we get 7/2. ∴ y = 7/2, x = 2.