Question

What is the solution of the system? Use elimination. 3x – 4y = 9 –3x + 2y = 9

Answer 1

medal awarded to right answer

Answer 2

3x – 4y = 9 –3x + 2y = 9
consider 3x – 4y =9 -(1)
and 9 –3x + 2y = 9 -(2)
(1)+(2)
3x – 4y + ( 9 –3x + 2y) = 9+9
9-2y = 18
2y = 9
y = 9/2 = 4.5
put y= 4.5 into (1)
3x -4(4.5) = 9
3x = 27
x=9

Answer 3

wait

Answer 4

x=-9 because and y=-9

because the 3x cancel out. and then you substitute back into the equation the answer to -9

Answer 5

4.5 isnt an option

Answer 6

@order thanks

Answer 7

9-2y = 18
2y = -9
y = -9/2 =- 4.5
put y= 4.5 into (1)
3x -4(-4.5) = 9
3x = -9
x=-3

Answer 8

No problem, but are you sure you understand?

Answer 9

yea when she said 4.5 i knew it was wrong

Answer 10

3x-4y=9
+ -3x+2y=9
--------------
-2y=18

y=-9

Answer 11

sorry, but your question misled me
when you typed . 3x – 4y = 9 –3x + 2y = 9
it should be considered as 3x – 4y = 9 and 9–3x + 2y = 9
if you mean 3x – 4y = 9 and –3x + 2y = 9 you should at least separate them for a longer distance or add a 'and' in between.

Answer 12

3x-4(-9)=9
3x+36=9
3x=-27
x=-9

Answer 13

That's fine. I was confused at first too :p