ajutati-ma va rog mult !

____ ____
a) 7x = y8
x=8 y=7
__ ___
d)xx = y2
x=2 y=2
____ ____
c) 5y7 < 50x
y=0 x=8,9
____ ____
b) 2xy > 289
x=9 y=0,1,2,3,4,5,6,7,8,9
_______ _______
e) 72x398<sau= 724y28
x=4,3,2,1 y=3,4,5,6,7,8,9