Question

Na equação,2x+5y=20,qual valor de x se y vale -2

Answer 1

$\boxed{\begin{array}{lr} 2x+5y=20 \end{array}}$

sendo y = -2

$\boxed{\begin{array}{lr} 2x+5y=20\\2x-10=20\\2x=20+10\\2x=30\\x=\frac{30}{2}\\x=15 \end{array}}$

Resposta;

x = 15