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Ashly
Mathematics
3 September, 02:00
What's the solution?
x+2y=-2
2x-4y=0
+1
Answers (
2
)
Howard
3 September, 02:16
0
X+2y=-2
2x-4y=0
multiply the first equation by 2
2x+4y=-4
add this to the first equation
2x+2x-4y+4y=0-4
add like terms
4x=-4
divide both sides by 4
x=-1
subtitue into 1st equation
-1+2y=-2
add 1 to both sides
2y=-1
divide both sides by 2
y=-1/2
another way is
since 2x-4y=0
so 2x must equal 4y
subtitue and get answer
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Keenan
3 September, 02:17
0
1. Let's solve for x
. x + 2y = - 2
Step 1: Add - 2y to both sides.
x + 2y + - 2y = - 2 + - 2y
x = - 2y - 2
Answer: x = - 2y - 2
2. Let's solve for x.
2x - 4y = 0
Step 1: Add 4y to both sides.
2x - 4y + 4y = 0 + 4y
2x = 4y
Step 2: Divide both sides by 2.
2x / 2 = 4y / 2
x = 2y
Answer: x = 2 y
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