book Maths Puzzle Numerical Ability

Which label describes the following? 3x + 6 = 10
A) Linear equation B) Equation which is not linear C) Expression

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book Other Question

Simplify.

1) (ab)3
2) (-3x)2
3) (-x2)3
4) -3x(x2+2)
Can you please help me with the following problem:
Rewrite the equation -2x + 3y = -15 as a function of x</PRE>