单选题
【正确答案】
A
【答案解析】To answer this question, first multiply the bottom equation by -3 to get -9x-21y=-246. Now you can add the two equations and eliminate one of the variables, as follows:
[*]
Substitute 10 for y in the first equation and solve for x:
9x-2(10)=16
9x-20=16
9x=36
x=4
Quantity A (x+y) is equivalent to 4+10, or 14, and Quantity B=10; therefore, Quantity A is greater than Quantity B.
[*]
Substitute 10 for y in the first equation and solve for x:
9x-2(10)=16
9x-20=16
9x=36
x=4
Quantity A (x+y) is equivalent to 4+10, or 14, and Quantity B=10; therefore, Quantity A is greater than Quantity B.