Govt school math
posted by
Anonymous on
.
X+y=18,2x+y=27

Govt school math 
Anonymous,
Solve the question by substitution method? Equation 1st x+y=18 equation 2nd 2x+y=27

Govt school math 
Reiny,
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