31-62=152+2-6(3+21)
31-62=152+2-18+126
-31 =262
<span>E=<span><span>cm/</span>r</span></span>
To solve for m, you have to get it by itself on one side of the equal sign.
To do that you have to eliminate c and r and put them at the other side.
r is being divided by m, so you have to do the opposite to get it on the other side, which is multiply. Multiplying r to both sides will remove the division, and give you <span>Er=cm</span><span>. So... B is the answer :)</span>
Answer:
V
=
2
Explanation:
we can rearrange the equation
p
1
=
8
V
←
cross-multiplying gives
p
V
=
8
←
divide both sides by p
⇒
V
=
8
p
=
8
4
=
2
Answer:
- 12x +15y = 4140; x + y = 300
- x = 120; y = 180
Step-by-step explanation:
The first equation is for receipts. Each x ticket generated $12 in receipts, so the first term needs to be 12x. Each y ticket generated $15 in receipts, so the second term needs to be 15y. U in this set of equations is the total number of tickets, said to be 300.
The equations are ...
12x +15y = 4140; x +y = 300
__
Using the second equation to write an expression for x, we have ...
x = 300 -y
Substituting this into the first equation gives ...
12(300 -y) +15y = 4140
3600 +3y = 4140
y = (4140 -3600)/3 = 180
x = 300 -180 = 120
The number of tickets sold is ...
$12 tickets -- 120
$15 tickets -- 180
_____
You might want to notice that the equation we ended up with:
4140 -12(300) = 3y
is equivalent to this "word solution." This can be done in your head; no equations required.
If all the tickets sold were $12 tickets, the revenue would be $3600. The revenue is $540 more than that. Each $15 ticket generates $3 more revenue than a $12 ticket, so to have $540 more revenue, we must have 540/3 = 180 $15 tickets.
