Question

1) Stiind ca x-2•y+13=52, determinati 3•x-6•y+1

Answer 1

x - 2y = 52 - 13
x - 2y = 39
3(x - 2y) + 1 = 
3 * 39 + 1 = 
118

Answer 2

x-2y+13=52⇒x-2y=39
⇒x=2y+39;
⇒3x-6y+1
⇒3[2y+39]-6y+1
⇒6y+117-6y+1⇒se reduce 6y cu 6y;
⇒117+1=118;