Question

Sa se afle x si y stiind ca sunt invers proportionale cu 2 si 3 si ca 4x+9y-60

Answer 1

x / (1/2) = y / (1/3) = k
2x=2y=k    x=y=k/2

4x+9y-60= 0
4 * k/2 + 9*k/2 =60   /(*2)
4k+9k=120
13k=120
k=120/13           x=y = k/2 = 120/13/2=60/13