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chubhunter [2.5K]

3 years ago

14

Solve by substitution

1 answer:

storchak [24]3 years ago

3 0

4x - 2y = 14
y = 1/2x - 1

4x - 2(1/2x - 1) = 14
4x - x +2 = 14
3x + 2 - 2 = 14 - 2
3x = 12
3x / 3 = 12/3
x = 4

2x = y -10
2x + 7 = 2y

y - 10 + 7 = 2y
y -y -10 + 7 = 2y - y
-3 = y

8x - 1/3 y = 0
12x + 3 = y

8x - 1/3y = 0
8x -1/3( 12x + 3) = 0
8x - 4x - 3 = 0
4x -3 + 3 = 0 + 3
4x / 4 = 3/4
x = 3/4

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