Can someone please check over the math work i did?

Question

anonymous · Answer

@mathmale  @CGGURUMANJUNATH @YanaSidlinskiy

anonymous · Answer

Given the equation 3x - 4y = 8, which equation below would cause a consistent-dependent system?

3x + 4y = -8

6x - 8y = 12

9x - 12y = 24

16x + 12y = -10  I got C

mathmale · Answer

Your choice is a good one.  9x - 12y = 24 is a multiple of 3x - 4y = 8.

anonymous · Answer

Choose the correct graph of the given system of equations.

y + 2x = -1
3y - x = 4

graph of two lines that intersect at the point (negative 1, 1)

graph of two lines that intersect at the point (1, 1)

graph of two parallel lines with positive slopes

None of the above 

I'm not understanding this one