Question

16r + 2s =-10
16r+s =13

Answer 1

{ 16r + 2s = -10
{ 16r + s   =  13

16r + s =13
s = 13 - 16r

16r + 2s = -10
16r + 2 (13-16r) = -10
16r + 26 - 32r = -10
16r - 32r = -10-26
-16r = -36
r = -36/-16
r =  2,25

s = 13 - 16r
s = 13 - 16 (2,25)
s= 13 - 36
s= -23

PROVA REAL
16r + 2s = -10
16 (2,25) + 2(-23) = -10
36 - 46 = -10 (correto)
$r= 2,25 \\ s= -23$