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3 years ago

Please helppp 15 pointsss What is the y-coordinate of the solution for the system of equations?

Mathematics

1 answer:

Lina20 [59]3 years ago

7 0

y = 3x - 1

x - y = -9

Subs y in second equation.

x - (3x - 1) = -9

x - 3x + 1 = -9

-2x = -9 - 1

-2x = -10

x = -10/-2

x = 5

Subs x

y = 3x - 1

y = 3.5 - 1

y = 15 - 1

y = 14

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3 years ago

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The answer is A: x=1/2 , y= 1/3

Solve the following system:
{2 x + 3 y = 2 | (equation 1)
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{6 x + 18 y = 9 | (equation 1)
{2 x + 3 y = 2 | (equation 2)

Subtract 1/3 × (equation 1) from equation 2:
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Divide equation 1 by 3:
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Multiply equation 2 by -1:
{2 x + 6 y = 3 | (equation 1)
{0 x+3 y = 1 | (equation 2)

Divide equation 2 by 3:
{2 x + 6 y = 3 | (equation 1)
{0 x+y = 1/3 | (equation 2)

Subtract 6 × (equation 2) from equation 1:
{2 x+0 y = 1 | (equation 1)
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Divide equation 1 by 2:
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3 years ago

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zaharov [31]

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