number of boys --- x
number of girls ---- y
x+y = 33
x-y = 5
2x = 38
then in the first:
19+y = 33
y = 33-19 = 14
We have 19 boys and 14 girls
do we have 33 students ? yes
do we have 5 more boys than girls? YES!!!!
To graph this
pick any two points so that x+y = 33
e.g. (15,18) and (5,28) , join them
pick any two points so that x-y = 5
e.g.( 10,5) and (20,15) , join them
the two lines should intersect at (19,14)
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