exam Maths Puzzle Numerical Ability

Solve the system by graphing, addition and substitution methods.
4x - 4y = -8
y = 2 + x

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exam Other Question

Given f(x) = 5x2 - 3x + 1, find f(-2).

Im getting -13
Am I correct?
I need help solving the following problem:

For a resistor in a direct current circuit that does not vary its resistance, the power the resistor must dissapate is directly propor