0.50x+0.75x=138.50
hd+hb=230
These are the system of equations.
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Answer:

Step-by-step explanation:
You need to subtract the coefficients to get the answer.
Let's look at the equation...

The coefficient is 3 and 1
So, you do 3-1
You get 2
So...
1, 1.5, 2, 2.5, 3, 3.5
Y si no se cuenta el uno:
1.5, 2, 2.5, 3, 3.5, 4.
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12