Question 160339
xy=30 or x=30/y
2x+2y=26
Now substitute (30/y) for x in the second equation & solve for y'
2(30/y)+2y=26
60/y+2y=26
(60+2y*y)/y=26
(60+2y^2)/y=26 now cross multiply;
60+2y^2=26y
2y^2-26y+60=0
2(y^2-13y+30)=0
2(y-10)(y-3)=0
y-10=0
y=10 answer.
y-3=0
y=3 answer.
Proof:
3*10=30
30=30
2*10+2*3=26
20+6=26
26=26