Question

solve by the elimination method
4x-9y=6.5
7y-2x=-4.5

Answer 1

4x-9y=6.5
-2x+7y=-4.5 X 2

=> 4x- 9y = 6.5
-4x+14y = 9
----------------
5y = 15.5
y = 3.1

=> 4x-9*3.1=6.5
=> 4x-27.9 = 6.5
=> 4x = 34.4
=> x = 8.6

Ans: x=8.6, y=3.1

Answer 2

that solution is not correct

Answer 3

Oh, sign mistake! I'll do it again :)

Answer 4

4x-9y=6.5
-2x+7y=-4.5 X 2

=> 4x- 9y = 6.5
-4x+14y = -9
----------------
5y = -2.5
y = -0.5

=> 4x-9*-0.5=6.5
=> 4x+4.5 = 6.5
=> 4x = 2
=> x = 0.5

Ans: x=0.5, y=-0.5

Answer 5

Is that right?

Answer 6

yes thank u.. can u help me with some others??