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The best way to tackle an unseen translation is with a calm and systematic approach. The student should start by skimming the passage to get a general sense of key themes and content, and also note the me...

dy/dx=6x+7

6x+7=0

x=-7/6

Sub back into original equation; y=98/6

2y=11-3x    and 2y=2x-14

11-3x=2x-14

25=5x   thus x=5

3(5) +2y=11

2y=-4    thus y=-2

Concentration of HCl, Mass of marble chips (use excess HCl).

Expansion of the given expression will result in x to the 3rd power, as there are 3 parts involving x, multiplied together. Let's ignore -5x for a second, and multiply the two expressions in brackets (usi...