exam Maths Puzzle Numerical Ability

i need step by step solution using elimination method,thank u

3x+4y=-15
3x+6y=-21

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exam Other Question

The area of a rectangular field is 42,000 meters squared. Julie finds that by taking a diagonal path instead of walking halfway around the field, she walks 120 meters less. how lon Multiply and simplify.

-3a^2b/35a^5 x 14a^3b^2/-9b^4

I have come up with 2/15b. Is this correct?