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4 years ago

15

Solve 7x − 2y = −3 14x + y = 14

2 answers:

Sauron [17]4 years ago

8 0

7x - 2y = -3

14x + y = 14
14x -14x + y = 14-14x
Y = 14 - 14x

7x -2y = -3
7x - 2(14 - 14x) = -3
7x -28 + 28x = -3
7x + 28x - 28 = -3
35x - 28 = -3
35x - 28 + 28 = -3 + 28
35x = 25
35x/35 = 25/35
X = 25/35 = 5/7.

Y = 14 - 14x
Y = 14 - 14(5/7)
Y = 14 - 10
Y = 4.

The solution P(5/7,4).

weeeeeb [17]4 years ago

6 0

$(\frac{5}{7},4)$

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