Question 71887
{{{x + 5y =  10}}} ___________(1)
{{{-2x - 10y = -20}}} ___________(2)

Multiply eqn (1) with -2 we have

(-2)(x + 5y = 10)
{{{(-2)x + (-2)5y = (-2)10}}}
{{{-2x - 2*5y = -2*10}}}
{{{-2x - 10y = -20}}}

But this is same as equation (2).

So equations (1) & (2) are dependent.