Answer:
6
/19
≅ 0.3157895
Step-by-step explanation:
3x + 2y = 12
2y = -3x + 12
y = -1.5x + 6
You said x + 2/5 = 12
It might be easier to handle if we use the decimal for 2/5.
x + 0.4 = 12
Subtract 0.4 from each side: x = 11.6
That's all there is to it. I'm sorry I can't make it
more complicated for you.
20 - (4xn) = 4 is the equation