Question

5x+4/y=7 And 4x-3/y=5 (solve using cross multiplication method) ICSE

Answer 1

Answer:

4x+3y=29 ----- (1)

6x+3y=39 ----- (2)

First use formula for cross multiplication method:

b1​c2​−b2​c1​x​=c1​a2​−a1​c2​y​=a2​b2​−a2​b1​−1​

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

3×39−3×29x​=29×6−4×39y​=4×3−6×3−1​

117−87x​=174−156y​=12−18−1​

30x​=18y​=−6−1​

30x​=−6−1​

x=−6−30​=5

18y​=−6−1​

y=−6−18​=3

The solution is (5, 3)

Answer 2

Step-by-step explanation:

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