Question 84008
If you want to solve the system

{{{x + y = -4}}}
{{{x - y = 2}}}

by addition/elimination, then...


*[invoke solving_linear_system_by_elimination 1, 1, -4, 1, -1, 2]

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Start with the given system
{{{x + y = 10}}}
{{{y = x + 8 }}}


{{{x + (x+8) = 10}}} Plug in y=x+8
{{{2x+8 = 10}}}
{{{2x= 2}}}
{{{x=1}}}

Now substitute x=1 into {{{y=x+8}}}
{{{y = 1 + 8 }}}
{{{y=9}}}

So the solution is (1,9)

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If you want to solve the system

{{{3x + y = 5}}}
{{{4x - 7y = -10}}}

by addition/elimination, then...


*[invoke solving_linear_system_by_elimination 3, 1, 5, 4, -7, -10]

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If you want to solve the system

{{{y - 2x = -5}}}
{{{3y - x = 5}}}

by addition/elimination, then...


*[invoke solving_linear_system_by_elimination -2, 1, -5, -1, 3, 5]