2 years ago

2x - 4y = 12 3x - 5y = 20

1 answer:

7 0

You multiply the first equation by 3 and the second one by 2:
3*(2x - 4y = 12) = 6x - 12y = 36
2*(3x - 5y =20) = 6x - 10y = 40
Then use elimination:
6x - 12y = 36
- (6x - 10y = 40)
= -2y = -4
Solve:
y = 2
Then, plug 2 into the first equation and solve:
2x - 4(2) = 12
2x - 8 = 12
2x = 20
x = 10
There is the answer, x = 10 and y = 2.

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2 years ago

Explain how you could use a number line to show that -4+3 and 3+(-4) have the same value.which property of addition states that

Anna007 [38]

For -4+3,
1. start with zero
2. move to left (-x axis) for 4 units (-4)
3. then move to right (+x axis) for 3 units (+3)

For 3+(-4)
1. Start with zero
2. Move the point to right side by 3 units (+3)
3. then move the point to the left by 4 units (-4)

For both you'll stop at -1.