Question 987383
x=number of 5p coins; y=number of 10p coins=3x+2
5x+10y=440
5x+10(3x+2)=440
5x+30x+20=440
35x=420
x=12 
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ANSWER: There are twelve 5p coins
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CHECK:
5x+10y=440
5(12)+10y=440
60+10y=440
10y=380
y=38 There are 38 10p coins.
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y=3x+2
38=3(12)+2
38=36+2
38=38