Question

Resolva:
y-t2=6
2y+t2=39

Answer 1

y - t² = 6
2y + t² = 39

y = 6+t²
2.(6+t²) + t² = 39
12 + 2t² + t² = 39
3t² = 39 - 12
3t² = 27
t² = 27/3
t² = 9
t = √9
t = 3

y = 6+t²
y = 6+3²
y = 6+9
y = 15