Recall that for
, we have

Replace
with
and we get

Lastly, multiply this by
, so that

Answer is 11
-(-7+4)
Firstly, negative times negative equals to positive so It becomes like this:
+7+4
equals to 7+4
equals to 11!
I hope this is helpful :D
K = 1.2
Short answer.It's going to seem odd, but one of the ways you could solve this is by multiplying the first equation by 4. I'll tell you why in a moment.
4(0.3x - 0.7y = 1) Now remove the brackets.
1.2x - 2.8y = 4 If you want there to be no solution, the way to do it is the make k = 1.2 The second equation becomes.
1.2x - 2.8y = 3
I'm going to give you the graph of this so you will see why there is no solution. Do you see why?
The lines are parallel!! they never meet.
-1/6 + 2/3 (9-3/4)-1/2
= -1/6 + 2/3 (33/4) -1/2
= -1/6 + 11/2 - 1/2
= 16/3 - 1/2
= 29/3
I don’t know I’m sorry I got 6x and I don’t think that’s right