﻿ SAT数学之解方程组 - 华樱外语    SAT数学

SAT数学之解方程组

View：how to create the equations
eg:
A duck travels from point A to point B. If the duck flies 3/4 of the way, walks 1/9 of the way and swims the remaining 10 kilometers of her trip, what is the total distance in kilometers traveled by the duck?
A.45           B.56          C.72          D.108

solving the systems of the linear equations

eg:  4x+2y=18 and x+y=5,what is the value of x,y and 10x+6y?

Practice:
1.If x and y are real numbers such that 3x+4y=10 and 2x-4y=5,then what is the value of x?
2.If 12a-3b=131 and 5a-10b=61,then what is the value of a+b?
3. If 4n-8m=6,and -5n+4m=3,then n=?

Some more exercise
eg:
If ab=3, bc=5/9, ac=15,what is one possible value of abc?
A.5           B.8.33              C.18.54              D.25
1.If ab=1/8, bc=6, ac=3, what is one possible value of abc?
A.3.75        B.2.25           C.1.5              D.0.25
2. If xyz=4, and y  z=5,what is the value of x/y?  ﻿ ﻿

机经预测 ﻿

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