Answer: [tex]\left \{ {{d+m=100} \atop {12d+10m=1120}} \right.[/tex]
Step-by-step explanation:
Let be "d" the number of kilograms of dark chocolate MIchael buys and "m" the number of kilograms of milk chocolate he buys.
Since Michaels needs to buy a total of 100 kilogram of chocolate, we know that the sum of "d" and "m" is 100. Knowing this, we can write this equation:
[tex]d+m=100[/tex]
Knowing that the Dark chocolate costs $12 per kilogram (which can be expressed with [tex]12d[/tex]) and milk chocolate costs $10 per kilogram (this can be expressed [tex]10m[/tex]), and he wants to spend $1120 total, we can write the following equation to represent this:
[tex]12d+10m=1120[/tex]
Therefore, the system of equations that represents this situation is:
[tex]\left \{ {{d+m=100} \atop {12d+10m=1120}} \right.[/tex]