Posted by LAnae on Thursday, May 6, 2010 at 8:59pm.
a total of $ 14,000 is invested in two funds paying 4% and 5% annual interest. The combined interest is $620 a)write a system of equations to model this problem b). graph this system and use the graph to estimate how much was invested in each fund?

Math  Reiny, Thursday, May 6, 2010 at 9:25pm
how about
x+y = 14000
.04x + .05y = 620  4x + 5y = 62000
graph using intercepts,
for x+y = 1400 > (0,14000) (14000,0)
for 4x+5y=62000 >(0,12400), (15500,0)
on your grid, let each unit be 1000