Answer:
a = 
Step-by-step explanation:
First, you want to add d on both sides.
ab-d = c
<u>+d +d</u>
ab = c+d
Now, divide b on both sides.
ab = c+d
<u>/b /b</u>
a =
I hope this helps; have a great day c:
(Also, I just realized that I solved only the question that you typed, not the picture...do you need the answer for the question in the picture???)
790,000
I believe b/c 89,000 rounds to 90,000
R= m/4 Becuase if you take m=4R and divide 4 by m which equals your work for number two so 5 equals m
4)
I:3x+4y=67
II:5x-y=35
to eliminate y when they are added one of the equations must contain -ay and the other +ay (with a being some number)
in this case we have in I already a positive term and in II a negative, but they have different numbers
by using multiplication (property of equations) we can multiply II by 4 so the negative and positive parts match
II*4: 20x-4y=140
when I and 4*II get added this results in
3x+20x+4y-4y=67+140
23x=207
5)
in this case I and II were added which can be seen in the left side of the equation((3x+4y)+(5x-y)=8x+3y), so to get the right side we have to also add the right sides 67+35=102
so the full equation would be:
8x+3y=102
