10. Over twenty years, it was found that the number of doctors of medicine, MD (in thousands), in the United States can be approximated by where represents 1980. The number of doctors of osteopathy, DO (in thousands), can be approximated by .
a. Write an expression for the total number I of doctors of medicine (MD) and doctors of osteopathy (DO). Simplify the result.
b. How many MDs did the United States have in 2010? How many DOs did the United States

X=14 hope it !

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!

It would have infinite solutions.