Question

Solve using cross multiplication method
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Qn is. 3x-5y=20
7x-2y=17

Answer 1

Answer:

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Step-by-step explanation:

3x-5y-20=0 take a1=3 b1=-5 c1=-20

7x+2y-17=0 take a2=7 b2=2 c2=-17

now by cross multiplying method

(x/b1×c2-b2×c1)=(y/c1×a2-c2×a1)=(1/a1×b2-b1×a2)

now put all values like a1,a2..in this formula and solve

(x/85+40)=(y/-140+51)=(1/6+35)

x/125=y/-89=1/41

now,take x/125=1/41 or y/-89=1/41

therefore x=125/41 and y=-89/41

hope that you understand!!!!

Answer 2

Answer:

3x(-2y)-5y(7x)=20(17)

-6xy-35xy=340

-41xy=340

XY=340+41

XY=381