To get admitted to top universities, the applicant's sat (scholastic aptitude test) score must be on a very high side. in terms of concepts learned in mat201, this means that: question 9 options: a) the applicant's sat z-score has to be positive and large. b) the applicant's sat z-score has to be negative. c) the applicant's sat z-score has to be close to zero d) the applicant's sat z-score has to be close to one.

No i refuse to tell you the answer but the estimate is 10

Ok here we go ..there are plenty of ways to solve such math problems but we will go for the smartest and easiest ..5x+2y=7  -2x+6y=9we rearrange them into the following ..by multiplying the 1st equation by 2 it becomes 10x + 4y = 14we rearrange it and so it becomes 10x = 14 - 4yas for the second equation we multiply it by 5 and rearrange it so it becomes as to the following ..-10x + 30y = 45rearranging so 10x = 30y -45now 10x equals both 14 - 4y and 30y -45so   14 - 4y = 30y -4531 = 26yy= 31/26 = 1.19 or around 1.2so by now we can calculate x easily as  -2x+6y=9so 2x = 6y -9 = 6 * 31/26 - 9 = -1.84  then x = - 0.92 or around -0.9best luck!