Question

система5(х-3у)-26=2х+1, 3(-6у)+4=9у+19

Answer 1

5x-15y-26=2x+1;
-18y+4=9y+19;

3x-15y=27;      (:3)
-27y=15;         (:3)

x-5y=9;
-9y=5; 

x-5y=9;
y=-0.5;

x-5(-0.5)=9;
y=-0.5;

x+2.5=9;
y=-0.5;

x=6.5;
y=-0.5.