solve the equation 3x+2y = -25and 2x+y=-10 using cross multiplcation method
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3x+2y = -25; 2x+y=-10
3x+2y -25= 0; 2x+y+10 = 0
a1 = 3. b1=2 c1 = 25
a2 = 1. b2= 1 c2= 10
Cross multiplication method..
(b1×c2 - b2×c1) / x = ( c1×a2 -a1×c2) / y = 1/(a1×b2- a2×b1)
(2×10 - 1×25)/x = (25×1 - 3×10)/y = 1/(3×1 + 2×1)
20-25/x = 25-30/y = 1/5
-5/x = -5/y = 1/5
-5/x = 1/5 ; -5/y = 1/5
-5/5 = x ; -5/5 = y
x = -1 ; y = -1
3x+2y -25= 0; 2x+y+10 = 0
a1 = 3. b1=2 c1 = 25
a2 = 1. b2= 1 c2= 10
Cross multiplication method..
(b1×c2 - b2×c1) / x = ( c1×a2 -a1×c2) / y = 1/(a1×b2- a2×b1)
(2×10 - 1×25)/x = (25×1 - 3×10)/y = 1/(3×1 + 2×1)
20-25/x = 25-30/y = 1/5
-5/x = -5/y = 1/5
-5/x = 1/5 ; -5/y = 1/5
-5/5 = x ; -5/5 = y
x = -1 ; y = -1
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