9. In the Image Size dialog box at right, (Image/Image Size) what will happen if you change one of the dimensions in the box and you have "Constrain Proportions" checked, with the chain icons appearing at the right of the boxes?
The height and width will change proportionately

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"Constraitn Proportions" automatically adjusts both dimensions when you change one of the dimensions, be it in the "Document Size"area, or the "Pixel Dimensions" area. In addition, the resolution number changes automatically

The height and width will change disproportionately  
The image will change only along one dimension

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