Question 1102710
x + y = 20
5x + y = 0 ----> y = -5x  {subtracted 5x from each side}


x - 5x = 20   {substituted -5x, in for y, into first equation}
-4x = 20   {combined like terms}
x = -5   {divided each side by -4}


x + y = 20   {first equation}
-5 + y = 20   {substituted -5, in for x, into first equation}
y = 25  {added 5 to each side}


x = -5 and y = 25
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