Expression 19: 4 "a" left parenthesis, "y" minus 2 "b" , right parenthesis equals negative 4 "b" "x" left brace, 0 less than "x" less than 4 "a" , right brace Has graph.4ay−2b=−4bx0<x<4a
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Expression 20: 4 "a" left parenthesis, "y" minus 2 "b" , right parenthesis equals negative 4 "b" "x" left brace, 4 "a" less than "x" less than 0 , right brace Has graph. To audio trace, press ALT+T.4ay−2b=−4bx4a<x<0
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Expression 21: 1 quarter left parenthesis, "x" , right parenthesis squared plus left parenthesis, "y" , right parenthesis squared equals 1 Has graph. To audio trace, press ALT+T.14x2+y2=1