exam Maths Puzzle Numerical Ability

please can you help with this problem 2y-x =3 x=3y-5 university of phoenix elementary and intermidiate algebra

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exam Other Question

please show me how to do this.
Simplify the rational expression:
x2 - 3x - 10
x2 - x - 20 The combined resistance of two resistors R1 and R2 in a
parallel circuit is given by the formula

Rt= 1 divided by 1/r1+1/r1 simplify the formula. woosh over my head!