Or imma call safiya deposited money into a bank account that earned 6.5% simple interest each year. after 3 1/2 years, she had earned $36.40 in interest on the account. if no other money was deposited into or withdrawn from the account, how much was her initial deposit?

I=PRT
I=interest
P=amount invested
R=rate in decimal
T=time in years

given
I=36.40
P=?
R=6.5%=0.065
T=3 and 1/2 or 3.5

so

36.4=?*0.0625*3.5
36.4=?*0.2275
divide both sides by 0.2275
160=?

the initial deposit was $160

Do you mean conversion factor?

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!