exam Maths Puzzle Numerical Ability

-3r+5-3s-7+8s-2t-r i dont need the answer, i just need to know how to do this kind of a problem...answer is optional. please help me do this!!!

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exam Other Question

Can you please help me find the slope of hte equation 6x-5y=30. Find the values for m and b in the following system so that the solution to the system is (-3,4)

5x+7y=b
mx+y=22



The value for m =>



The value for b =>