兩題的數學的問題

[handsome_man]

In the xy-plane, what is the x-intercept of the line whose equation is 3y – 4x = 15?

A. – 15/4
B. – 4/3
C. 4/3
D. 15/4
E. 5


為什麼不是d而是a~截距沒有負數不是嗎~還是intercept在這裡有其他的解釋呢~可以幫我解答嗎~~


A total of 30 percent of the geese included in a certain migration study were male. If some of the geese migrated during the study and 20 percent of the migrating geese were male, what was the ratio of the migration rate for the male geese to the migration rate for the female geese?
[Migration rate for geese of a certain sex = (number of geese of that sex migrating) / (total number of geese of that sex)]

A. 1/4
B. 7/12
C. 2/3
D. 7/8
E. 8/7

不知道要怎算~~可以幫我寫個算式解釋一下嗎~謝謝~

[feiberkeley]

In the xy-plane, what is the x-intercept of the line whose equation is 3y – 4x = 15?

A. – 15/4
B. – 4/3
C. 4/3
D. 15/4
E. 5


為什麼不是d而是a~截距沒有負數不是嗎~還是intercept在這裡有其他的解釋呢~可以幫我解答嗎~~



A total of 30 percent of the geese included in a certain migration study were male. If some of the geese migrated during the study and 20 percent of the migrating geese were male, what was the ratio of the migration rate for the male geese to the migration rate for the female geese?
[Migration rate for geese of a certain sex = (number of geese of that sex migrating) / (total number of geese of that sex)]

A. 1/4
B. 7/12
C. 2/3
D. 7/8
E. 8/7

不知道要怎算~~可以幫我寫個算式解釋一下嗎~謝謝~

1. 這裡指的是線與x軸的截點, y代0

2. [(2/10) / (3/10)] / [(8/10) / (7/10)] = 7/12