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Sagot :
(one way is to subsitute since both equal 9 you do 3x-4y=-3x+2y then add 3x to both sides 6x-4y=2y add 4y to both sides 6x=6y divide by 6 x=y now subsitute 3x-4x=9 -x=9 multiply -1 x=9 x=y y=-9)
use elimination
add them together to cancel x terms
3x-4y=9
-3x+2y=9 +
0x-2y=18
-2y=18
divide by 2
-y=9
multiply -1
y=-9
subsituete
3x-4y=9
3x-(4 times -9)=9
3x-(-36)=9
3x+36=9
subtract 36 from both sides
3x=-27
divide both sides by 3
x=-9
x=-9
y=-9
the answer is in (x,y) form
(-9,-9)
the answer is none of them (D is closest)
use elimination
add them together to cancel x terms
3x-4y=9
-3x+2y=9 +
0x-2y=18
-2y=18
divide by 2
-y=9
multiply -1
y=-9
subsituete
3x-4y=9
3x-(4 times -9)=9
3x-(-36)=9
3x+36=9
subtract 36 from both sides
3x=-27
divide both sides by 3
x=-9
x=-9
y=-9
the answer is in (x,y) form
(-9,-9)
the answer is none of them (D is closest)
Answer:
(-9,-9)
Explanation:
The two given equations are:
3x - 4y = 9
-3x + 2y = 9
First step is to add the two equations in order to eliminate the x.
This will give us:
-4y + 2y = 9 + 9
-2y = 18
y = -9
Now, we substitute with the value of y in any of the equations to get x as follows:
3x - 4y = 9
3x - 4(-9) = 9
3x + 36 = 9
3x = -27
x = -9
Hope this helps :)
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