exam Maths Puzzle Numerical Ability

Rewrite the equation -7x + 8y = -40 as a function of x.

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can you please help me to understand this problem.

2. (4 points) Write down all possible subsets of {a, b, c, d}
f(x)=square root of x+2, g(x)=8x-6. Find (f*g)(x)