exam Maths Puzzle Numerical Ability

SOLVE THE SYSTEMS USING THE GAUSS-JORDAN METHOD

THIS IS MY PROBLEM: x-2y= -1
2x+y= -7


I KNOW HOW TO FIRST SET IT UP BUT FROM THERE IT IS ALL DOWN HILL..

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exam Other Question

One day, the temperature at 8:00 A.M. was 41°F, and by 1:00 P.M. the temperature was 61°F. What was the hourly rate of temperature change? THE QUANTITY y VARIES AS x AND INVERSELY AS z. IF y=15 WHEN x= 50 AND z= 10, FIND y WHEN x= 65 AND z= 5.

PLEASE HELP ME LEARN HOW TO EVEN BEGIN THIS PROBLEM.. I DO NOT EVEN KNOW