exam Maths Puzzle Numerical Ability

If the two given equations are being solved so that one unknown is eliminated by the method of comparison, which of the following steps is essential
6x+2y=7
6x-5y=8
A. 6x+4y=14

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0.51m+0.03=0.4m-0.74 Susan needs to find out the surface area of a deck that has one side that is 5.75 feet and another that is 8 feet and another that is 3 feet by 5.75 feet.