Which is not a solution to the system of inequalities below?
x - y> -10
3x +y ≤ 10
(0,0)
(5,-5)
(2,4)
(-4,6)

The correct answer is: b

The answer is part a: use

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