Start with the second part of your equation
4x + 10 = 18
4x = 8 Subtract 10 from both sides
x = 2 Divide by 4 on both sides
Now substitute 2 for x on the first part of your equation
2 (2) - 5y = 11
4 - 5y = 11 Simplify
-5y = 7 Subtract 4 from both sides
y = -7/5 or -1.4 Divide by -5 on both sides
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