Question
For the system { 3 x − 2 y = 4 , which is the solution to the system?
4 x − 3 y = 7
A. (−2,−5)
B. (2,−5)
C. (−2,5)
D. (2,5)
4 x − 3 y = 7
A. (−2,−5)
B. (2,−5)
C. (−2,5)
D. (2,5)
Answers
Reiny
3 x − 2 y = 4 , 4 x − 3 y = 7
You could try each given points in both equations.
The correct point must satisfy each equation, it might
actually be just as easy and quicker to just solve it.
1st one by 3 ----> 9x - 6y = 12
2nd by 2 ---------> 8x - 6y = 14
subtract them: x = -2
that eliminates 2 of your choices, so just find y
You could try each given points in both equations.
The correct point must satisfy each equation, it might
actually be just as easy and quicker to just solve it.
1st one by 3 ----> 9x - 6y = 12
2nd by 2 ---------> 8x - 6y = 14
subtract them: x = -2
that eliminates 2 of your choices, so just find y