Which of the following equations is equivalent to x - y = 8?

1) 2x - 4y = 8
2) 2x - 4y = 64
3) 4x - 2y = 64

Say x = 12 and y = 4 
12 - 4 = 8

Number 1
2(12) - 4(4) = 8
24 - 16 = 8
Number 1 is your Answer

Add up all the sides

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post