Question 1037104
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Hi! I really need help with this problem. 
At Lisa's sandwich Shop, two chicken sandwiches and four cheese sandwiches cost $18. 
Five chicken sandwiches and six cheese sandwiches cost $34. Which type of sandwich is more expensive, and by how much? 
Thanks! 
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<pre>
2x + 4y = 18,    (1)
5x + 6y = 34.    (2)

Multiply the first eqn by {{{3/2}}} (both sides). You will get

3x + 6y = 27,    (1')
5x + 6y = 34.    (2').

Now, distract eqn (1') from (2'). You will get

2x = 34 - 27 = 7.

From this point, please complete the solution on your own.
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