Question 250837
Here are the original equations:
(i) {{{4x +  y = - 9}}}
(ii){{{4x + 2y = - 10}}}
To eliminate means some kind of multiplication and then add down to get rid of a variable. So, let's multiply the first equation by -1.
(iii) {{{-4x -  y = 9}}}
(iv)  {{{4x  + 2y = -10}}}
adding down gives us
(v) {{{y = -1}}}
substitute this back into (i) to get x.
{{{x = -2}}}.