Would appreciate if anyone could show me how to do the following :-
Euan plays in a snooker tournament which consists of 20 games
He loses x games and wins y games
a) Write down an equation in x and y to illustrate this information.
b) He is paid £5 for each game he wins and £2 for each game he loses.
He is paid a total of £79
Write down another equation in x and y to illustarte this information.
c) How many games did Euan win.
I am happy with a) x+y=20 and b) 5x+2y=70 but
would like to know how to work out step by step c) above