In Problems 61–64, draw a quick sketch of each equation. 61. у - 62. x = y? 63. y = Vĩ 64. у 65. If (3, b) is a point on the graph of y = 4x + 1, what is b? 66. If (-2, b) is a point on the graph of 2x + 3y = 2, what is b? 67. If (a, 4) is a point on the graph of y = x² + 3x, what is a? 68. If (a, -5) is a point on the graph of y = x² + 6x, what is a?

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