3x -5y=20 7x+2y= 17 solve by cross multiplication method
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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!!!!
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!!!!
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