exam Maths Puzzle Numerical Ability

3x-2y=4
2x-5y=21

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exam Other Question

Can someone help me on this?

I need to add the following in the lowest terms:

2/7 + 2/7 + 6/7

Thanks, Lyn calculate the distance between two points:
a. (0,0) and (-3,4) b. (2,1) and (7,13)

D= sqrt [(x2-x1)squared+(y2-y1)squared]