exam Maths Puzzle Numerical Ability

How do I graph this equation on a rectangular coordinate system?

14. y= x-3

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exam Other Question

the rule x,3/4y is applied to a polygon is the image similar to the original polygon? Also the given point is on the original polygon find the image of the point. a.(6,8) b.(9,8 The length of a rectangle is 1cm longer than its width. If the diagonal of the rectangle is 4cm, what are the dimensions(the length and width) of the rectangle?

x + (x+1)= 4

Am I on the right track in solving this problem?