Question 122552
A) .1x+.07y=1400
B) .07x+.1y=1490
.
A) 
.1x=1400-.07y
x=14000-.7y multiply each side by 10.
.
B) 
.07(14000-.7y)+.1y=1490
980-.049y+.1y=1490
.051y=510
y=10000
.
A)
.1x+.07(10000)=1400
.1x+700=1400
.1x=700
x=7000
.
Check:
B)
.07(7000)+.1(10000)=1490
490+1000=1490 true
.
Ed