16a+4b=20, -33a+8b=-47

solve by elimination 16a+4b=20, -33a+8b=-47
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1 Answer

line 1..16x+4y=20  or 4x+y=5 or y=-4x+5

line 2...33x -8y=47

2*line1...32x+8y=40, then add line2

32x+33x +(8y-8y) =40+47

65x=87

x=87/65...1.338461538

y=-4x+5...(-4)*(1.338461538=-5.353846154, then add 5 & yu get

y=-0.353846154
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