X+y=4 2x+3y=9 how can i find out if its independent , consistent, and dependent or inconsistent

Agrain trader buys the following amounts from three suppliers: 3,200 pounds, 5,100 pounds and 700 pounds. what is the total weight of his purchase?

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

Frank owns a $141,000 home, for which he has a 30-year mortgage in the amount of $700 a month. once he has paid off mortgage, how much will he have paid in investment? a. $111,000 b. $109,000 c. $120,000 d. $141,000