F x is the percent return of U. S. stocks and y is the percent return on overseas stocks in the same year, the least-squares regression lie for predicting y from x is y = 0.47x – 1.53. You think U. S. stocks will have a return of 10% in 1999. Using this regression line, you predict that the return on overseas stocks will be A. 7.4%
B. −2.23%
C. 2%
D. 3.17%

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!

Part a: e = 14xpart b: t = 20ypart c: 14(35) = 490610 - 490 = 120t= 20y120= 20y6=y35+6= 41  hours worked