Posted by **abhigyan** on Monday, June 17, 2013 at 2:11am.

using glazed paper ,show that 3/-7 and -9/21 are in prpportion.

- mathematics -
**MathMate**, Monday, June 17, 2013 at 6:43am
The way to proceed is:

1. plot the two points (3,-7) and (-9,21) on graph paper

2. join the two points with a straight line (using a straight-edge)

3. If the line passes through the origin, then the two ratios are in proportion.

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