Question 669879
x+y=10
2x+3y=33
...
Substitute
2(10-y) + 3y = 33
20 - 2y + 3y = 33
y = 33 - 20 = 13
{{{highlight_green(y=13)}}}
...
2x + 3(10-x) = 33
2x + 30 - 3x = 33
-x = 33 - 30
-x = 3
{{{highlight_green(x = -3)}}}
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