# Govt school math

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X+y=18,2x+y=27

• Govt school math -

Solve the question by substitution method? Equation 1st x+y=18 equation 2nd 2x+y=27

• Govt school math -

subtract the first from the second ...

2x+y = 27
x + y = 18
-----------
x = 9

sub into the 1st:
9+y = 18
y = 9

so x=9 and y=9

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