Question 147824
Remember you can always check whether your answer is correct by plugging it back into your original equation.
{{{0.4x+3<=0.8x-6}}}
{{{0.4(2.25)+3<=0.8(2.25)-6}}}
{{{0.9)+3<=(1.8)-6}}}
{{{3.9<=-4.2}}}
Your answer led to a false statement.
It is not correct. 
{{{0.4x+3<=0.8x-6}}} Multiply by 10, that's a good idea. 
{{{4x+30<=8x-60}}}<--- This is the line where you made your mistake
Yes, you need to multiply each term on both sides by 10. 
You made a small multiplication mistake on both sides.
10(0.4)=4, you had 40.
10(0.8)=8, you had 80.
I think you can take it from there and finish it. 
Please re-post if you need any more help.