exam Maths Puzzle Numerical Ability

SUBSTITUTION:
8x=-2y-10
2x=4y

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exam Other Question

money questions get me lost....help!

A 20 year fixed-rate mortgage with an annual interest rate of 8.4% compounded monthly is taken on a $83,000 loan. What is the monthly payment to the nearest cent?

thanks for the help! solve by graphing
3y<-x+6
-y>-2x+4
there is a line under the < and >