exam Maths Puzzle Numerical Ability

I am trying to find an equation of a graph. I hope you can help me. Your site answered a couple of problems for me one time and after I saw the whole problem worked out, it made

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exam Other Question

Solve the pairs of equations using the substitution method:
problem#6. x=1-y
y=x-9

problem#7. 2x-y=0
3x-2y=-3 Surface area of a cube. The formula A = 6V⅔ gives the surface area of a cube in terms of its volume V. what is the volume of a cube with surface area 12 square feet?