Question 59143
3x + 4y = 910   ==> eqn.#1    
10x + 5y = 1850 ==> eqn.#2

Simplify eqn.#2. Divide all terms by 5. This results to

2x +  y = 370 

Multiply both sides of this equation by -4, thus resulting to -8x - 4y = -1480.

Add this equation to eqn. #1 to eliminate y and solve for x:.

 3x + 4y =   910 
-8x - 4y = -1480
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-5x      = -570
Therefore x = 114. Substitute this value of x in eqn.#1 to find y.
Then the value of y = 142.

One brick layer makes $114 a day, while a labour worker receives $142 a day.