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2 years ago

Please solve this question

Mathematics

1 answer:

Alchen [17]2 years ago

4 0

Answer:

(3, 4 )

Step-by-step explanation:

3x - y = 5 → (1)

x + y = 7 → (2)

adding the 2 equations term by term will eliminate y

4x + 0 = 12

4x = 12 ( divide both sides by 4 )

x = 3

substitute x = 3 into either of the 2 equations and solve for y

substituting into (2)

3 + y = 7 ( subtract 3 from both sides )

y = 4

solution is (3, 4 )

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Answer: She spend $1.20 for lunch.

Step-by-step explanation:

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