Answer:
- Melissa: 30
- Ryan: 23
- Chau: 69
Step-by-step explanation:
Let r represent the number of messages Ryan sent. Then Chau sent 3r and Melissa sent r+7. Their total was ...
(r+7) +(r) +(3r) = 122
5r +7 = 122 . . . . . collect terms
5r = 115 . . . . . . . . subtract 7
r = 23 . . . . . . . . . . divide by 5
Ryan sent 23, Melissa sent 30, and Chau sent 69 text messages.
7x - xy = -18 x = -4
First, fill the -4 in where the "x's" are.
7<u>(-4)</u> - <u>(-4)</u>y = -18
Then, add the 28 over.
-28 + 4y = -18
<u>+28</u> <u>+28
</u>4y = 10
Then, get the variable by itself, so you would divide the 4 over.
4y = 10
<u>÷4</u> <u>÷4
</u>
<em><u>y = 2.5</u></em>
Well if 1=4 and it’s 11 1/2 then 4+4=8in and the left over is 3/4 of an inch .. 4+4+4=12 which is too much for it to work so I think it is 8 and 3/4in
4x - 7 = 13
4x = 13 + 7
4x = 20
x = 5
