Question 1182092

{{{2x+2y=15}}}....eq.1
{{{0.3x-0.2y=3}}}....eq.2........both sides multiply by {{{10}}} to get rid of decimal
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{{{2x+2y=15}}}....eq.1
{{{3x-2y=30}}}....eq.2
--------------------------------add both equations

{{{2x+2y+3x-2y=15+30}}}

{{{5x=45}}}

{{{highlight(x=9)}}}

go to

{{{2x+2y=15}}}....eq.1, substitute {{{x}}}

{{{2*9+2y=15}}}

{{{18+2y=15}}}

{{{2y=15-18}}}

{{{2y=-3}}}

{{{highlight(y=-3/2)}}}