-8y + 9x = -5
8y + 7x = -75 +
--------------------------
/ 16x = -80
x = -80/16
x = -5
8y + 7x = -75
8y - 35 = -75
8y = -75 + 35
8y = -40
y = -40/8
y = -5
Answer : x = y = -5
Answer:
For me to answer the question you will have to put another number
Andrew invests $7600 in two different accounts. The first account paid 9 %, the second account paid 14% in interest. At the end of the first year he had earned $829 in interest. How much was in each account?
Let
x ------> the amount invested in account that paid 9 %
7,600-x ------> the amount invested in account that paid 14%
we have that
9%=9/100=0.09
14%=14/100=0.14
so
(x)*(0.09)+(7,600-x)*(0.14)=829
solve for x
0.09x-0.14x+1,064=829
0.14x-0.09x=1,064-829
0.05x=235
x=4,700
Find the value of (7,600-x)
7,600-4,700=2,900
therefore
the answer is
<h2> the amount invested in account that paid 9 % was $4,700</h2><h2>the amount invested in account that paid 14% was $2,900</h2>
5000 metres because 1km is 1000 metres