exam Maths Puzzle Numerical Ability

find the rate change of the line passing through (-1,4) and (3,2)

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exam Other Question

i know how to do linear combination, but i cannot get the right answer for this problem:
2x+y+52=2y+50
2x+y+52=x-3y+131

I need help finding x and y.

Thank you!
Ms. Jefferson has been given a loan of $20,000 for 1 year. If the interest charged is $800, what is the interest rate on the loan?