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4 votes
7x-3y=13
9x+10y=-11
help me

User Gog
by
8.0k points

2 Answers

1 vote

Answer:

Explanation:

it's below

7x-3y=13 9x+10y=-11 help me-example-1
User Xhafan
by
7.2k points
2 votes

Answer:

(1, - 2 )

Explanation:

7x - 3y = 13 → (1)

9x + 10y = - 11 → (2)

multiplying (1) by 10 and (2) by 3 and adding will eliminate y

70x - 30y = 130 → (3)

27x + 30y = - 33 → (4)

add (3) and (4) term by term to eliminate y

97x + 0 = 97

97x = 97 ( divide both sides by 97 )

x = 1

substitute x = 1 into either of the 2 equations and solve for y

substituting into (2)

9(1) + 10y = - 11

9 + 10y = - 11 ( subtract 9 from both sides )

10y = - 20 ( divide both sides by 10 )

y = - 2

solution is (1, - 2 )

User Bluntfakie
by
7.9k points

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