The annual interest earned, y, in dollars, from account B when x dollars are invested for a year is given by y=0.062x. Which statement about these accounts is NOT true?
A
Account B earns 0.2% more interest in a year than account A earns.

B
Account A earns $48.90 when $815 is invested for a year.

C
Account A earns 2% more interest in a year than account B earns.

D
When $850 is invested for a year in account B, it earns $1.70 more than it would in account A.

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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!