题库搜索>问题求解PS-12372
In the xy-plane, what is the slope of the line with equation 3x + 7y = 9?
分析A选项
分析B选项
分析C选项
分析D选项
分析E选项
我有更好的解析 
暂无雷哥网文字解析
当前版本由 借我借我一双慧眼吧 更新于2015-12-09 13:46:30 感谢由 借我借我一双慧眼吧 对此题目的解答所做出的贡献。将原等式简化成y=(-3/7)x+9/7，所以为B
Q求斜率，这题
结合y=kx+b的格式 k就是斜率
7y=9-3x
Y=(9-3x)/7
K=-3/7
科目：
问题求解PS
来源：
GWD
题目信息42.86s
平均耗时
90.9%
平均正确率
该题由网友8ejtAs6p提供
点击上传问题求解PS -17801
If is defined to be the product of（n+k）（n-k+ 1) for all positive integers k and n, which of the following expressions represents ?
问题求解PS -17780
If C is the temperature in degrees Celsius and F is the temperature in degrees Fahrenheit, then the relationship between temperatures on the two scales is expressed by the equation 9C＝5(F-32). On a day when the temperature extremes recorded at a certain weather station differed by 45 degrees ...
问题求解PS -17778
A certain manufacturer uses the function C(x)=0.04x2 -8.5x+25,000 to calculate the cost,in dollars, of producing x thousand units of its product. The table above gives values of this cost function for values of x between 0 and 50 in increments of 10. For which of the following in...
问题求解PS -17554
For any positive integer x, the 2-height of x is defined to be the greatest nonnegative integer n such that 2n is a factor of x. If k and m are positive integers, is the 2-height of k greater than the 2-height of m ?(1) k > m(2) k/m is an even integer.
问题求解PS -17544
The function f is defined for each positive three-digit integer n by f(n)= 2x3y5z , where x, y and z are the hundreds, tens, and units digits of n, respectively. If m and v are three-digit positive integers such that f(m) = 9f(v), then m-v = ?
问题求解PS -17801
If is defined to be the product of（n+k）（n-k+ 1) for all positive integers k and n, which of the following expressions represents ?
问题求解PS -17780
If C is the temperature in degrees Celsius and F is the temperature in degrees Fahrenheit, then the relationship between temperatures on the two scales is expressed by the equation 9C＝5(F-32). On a day when the temperature extremes recorded at a certain weather station differed by 45 degrees ...
问题求解PS -17778
A certain manufacturer uses the function C(x)=0.04x2 -8.5x+25,000 to calculate the cost,in dollars, of producing x thousand units of its product. The table above gives values of this cost function for values of x between 0 and 50 in increments of 10. For which of the following in...
问题求解PS -17554
For any positive integer x, the 2-height of x is defined to be the greatest nonnegative integer n such that 2n is a factor of x. If k and m are positive integers, is the 2-height of k greater than the 2-height of m ?(1) k > m(2) k/m is an even integer.
问题求解PS -17544
The function f is defined for each positive three-digit integer n by f(n)= 2x3y5z , where x, y and z are the hundreds, tens, and units digits of n, respectively. If m and v are three-digit positive integers such that f(m) = 9f(v), then m-v = ?
分享
周末、晚班滚动开班 
24+35+35+6课时 
