Number 6 part a & b
Number 7
Please & thank you

Answer:
6- Part A: [tex]750a+1200r=1000000[/tex]
Part B: [tex]1065a+876r=1000000[/tex]
Solution of the system: [tex]a\approx521.739\;\;\;\;b\approx507.246[/tex]
Step-by-step explanation:
Part A:
In words, the equation is formed like this:
Total kg of Arabica + Total kg of Robusta = Total kg of coffee
Now, the total of each yield is calculated by the product of kg/hectare and number of hectares. Thus, the equation is:
[tex]750a+1200r=1000000[/tex]
Part B:
In words:
Arabica's worth + Robusta's worth = plantation worth
Each yield's worth is given by the product of the price per kg and the corresponding production. So, the equation is:
[tex]1.42(750a)+0.73(1200r)=1000000\\1065a+876r=1000000[/tex]