exam Maths Puzzle Numerical Ability

Solve the system of equation
5x+y=12
2x=3y-19

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exam Other Question

You scored 88.7, 91.2, and 94.6 on your last three test scores. Find the standard deviation of your test scores.
A. 0.95
B.1.22
C.2.42
D.4.35
The slope of a line through the origin is -2/3. Find the coordinates of the two points on the line. Thanks