Please solve this equation and check
2006-10-23 07:14:16 · 13 answers · asked by yo'yoalex 1 in Education & Reference ➔ Homework Help
7x-5=72
7x=77
x=11
2006-10-23 07:16:54 · answer #1 · answered by Big Rudy 3 · 0⤊ 0⤋
The first you have to do in Algebra is group like variables. Example, if you had 2X + 5 - X = 17 you would group 2X and -X and you would get the new equation: X + 5 = 17, which would give you X = 12.
Here, there are none to group, so here goes.
You need to isolate the X on one side.
So seeing as you have 7X - 5, to get rid of -5, you need +5, so you would re-write it like this
7X - 5 + 5 = 72 + 5
(What you do one side YOU MUST do to the other.)
So now you work that part out.
7X = 77
Now you have the X isolated, so you "Solve for X"
7X / 7 = 77 / 7
X = 11
Hope that helps, Good Luck!
2006-10-23 07:22:32 · answer #2 · answered by ClimbingCowgirl 2 · 0⤊ 0⤋
7x-10 = 10x -15 Subtract 7x to left side -10 = 3x - 5 Add 15 5 = 3x Divide by 3 5/3 or 1 2/3
2016-05-22 01:41:51 · answer #3 · answered by Anonymous · 0⤊ 0⤋
To get rid of the -5, you have to add 5, but you have to add it to each side, so 7x-5+5= 72+5 which gives you 7x=77. Now to get just x on the left side, you have to divide both sides by 7 because it is the common denominator, so 7x divided by 7 = 77 divided by 7, or x=11
2006-10-23 07:21:54 · answer #4 · answered by Anonymous · 0⤊ 0⤋
7x -5 =72
7x = 72+5
7x = 77
x = 11
2006-10-23 07:24:17 · answer #5 · answered by Jonny 2 · 0⤊ 0⤋
7x-5=72
7x=72+5
7x=77
x=77/7
x=11
Check 7(11)-5=72
77-5=72
2006-10-23 07:18:55 · answer #6 · answered by Vinnie C 3 · 1⤊ 0⤋
You just have to reverse it.
72 - 5 becomes 72 + 5 = 77
77 / 7 = 11
x = 11
2006-10-23 07:28:03 · answer #7 · answered by Slappy 3 · 0⤊ 0⤋
7x-5 actually equals -72.
2006-10-23 07:22:27 · answer #8 · answered by Anonymous · 0⤊ 0⤋
adding 5
7x=77
dividing by 7
x=11
2006-10-23 07:28:28 · answer #9 · answered by raj 7 · 0⤊ 0⤋
7x-5=72
72+5=7x
77=7x
77/7=x
11=x
2006-10-23 07:22:09 · answer #10 · answered by Wookie on Water 4 · 0⤊ 0⤋