are you sure of the given? i suppose you've mistaken = as +

thank you I already edit it.

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are you sure of the given? i suppose you've mistaken = as +

thank you I already edit it.

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-10x + 5y = 5 ----equation 1

x + y = 15 ----equation 2

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From equation 2

x + y = 15

x = 15 - y -----equation 2'

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Substitute equation 2' to equation 1

-10x + 5y = 5

-10(15-y) + 5y = 5

Distribute -10

-150 + 10y + 5y = 5

10y + 5y = 5 + 150

15y = 155

or

y = 10.33

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Substitute y=31/3 to equation 2'

x = 15 - y

x = 15 - 31/3

or

x = 4.67

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Using Elimination Method:

-10x + 5y = 5 ----equation 1

x + y = 15 ----equation 2

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Multiply equation 2 with 5

[x + y = 15] x5

5x + 5y = 75 ------equation 2'

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Subtract equation 1 from equation 2'

5x + 5y = 75

- -10x + 5y = 5

15x = 70

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Multiply equation 2 with 10

[x + y = 15] x10

10x + 10y = 150 ----equation 3

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Add equations 3 and 1

10x + 10y = 150

+ -10x + 5y = 5

15y = 155