Question 193525
let   x=  amount  invested  at  .07
let  y  =  amount  invested  at  .09

x+y=$12,000,,,,or  x=12000-y
total  made  is  970=.07x+.09y
subst
970=.07(12000-y)+.09y
970=840-.07y+.09y
130=.02y
y=6500
x=12000-6500=5500
check
.07*5500+.09*6500
385+585=970,,,,ok