400 lbs = ? tons and 38,600 mg = ? dekagrams

Which values for a and b will create infinitely many solutions for this system of equations? ax-y=8 2x+y=b

Asap describe the transformations required to obtain the graph of the function f(x) from the graph of the function g(x). f(x)=-5.8sin x. g(x)=sin x. a: vertical stretch by a factor of 5.8, reflection across y-axis. b: vertical stretch by a factor of 5.8,reflection across x-axis. c: horizontal stretch by a factor of 5.8, reflection across x-axis. d: horizontal stretch by a factor of 5.8 reflection across y-axis.

Idon’t understand! use slope intercept form to solve: through: (2,5) slope= undefined