The pairs of equations x+2y-5 = 0 and -4X-By+20=0 have: (a)Unique solution (b)Exactly two solutions (c)Infinitely many solutions (d)No solution
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X+2y-5=0...1 -4x-by+20=0...2 multiplring equation 1 by 4. 4X+8y-20=0....3 let adding equation 2 and 3. 0-by+8y=0. -by+y=0÷8. -by+y=0
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