exam Maths Puzzle Numerical Ability

I NEED HELP SOLVING
1.W1/W2 = D1/D2 FIND D1


2. 1/R= 1/r1+1/r2 FIND r2


3. I= 2V/R + 2R FIND R

4. S = H /M(T1 -T2) DIND H


5. S= a-ar little n /1-r find a

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exam Other Question
Rewrite the equation 2x - 8y = 48 as a function of x. Find values for m and b in the following system so that the solution to the system is (-6, 8).
5x + 7y = b
mx + y = 22

m = , b =