Question

solve: x+y=5 and x-y=7 by cross multiplication method
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Answer 1

Answer:

x=6

y=1

Step-by-step explanation:

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Answer 2

Answer:

x+y=7 ----- (1)

2x−3y=9 ----- (2)

First use formula for cross multiplication method:

b1c2−b2c1x=c1a2−a1c2y=a2b2−a2b1−1

So, from equation (1) and (2) we can write the value of a, b and c.

1×9−(−3)×7x=7×2−1×9y=1×(−3)−2×1−1

9+21x=14−9y=−3−2−1

30x=5y=−5−1

Step-by-step explanation:

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