Question

решите систему 7х/3-у/9=4 и 8х/5-у/30 3

Answer 1

{7x/3-y/9=4|*9
{8x/5-y/30=3|*30
-{21x-y=36
-{48x-y=90
-27x=-54|:(-27)
x=2
21*2-y=36
-y=36-42
-y=-6|:(-1)
y=6