Question 900956
In the future do not submit similar problems. 
Similar means they are the same type problem  but differ by  the numbers or addition vs subtraction.
x+y=7000,
0.04*x+0.09*y=292
x=7000-y
0.04*(7000-y)+0.09*y=292
280-0.04y+0.09*y=292
0.05*y=12
y=240 at 9%
x=7000-y
x=6760 at 4%
check
0.04*6760+0.09*240=292
270.4+21.6=292
292=292
ok