3y-2=19
2007-01-03 16:56:17 · 11 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Here's how:
3 y - 2 = 19 ; add 2 to both sides; then:
3 y = 21. Hence y = 7. QED
Live long and prosper.
2007-01-03 16:57:51 · answer #1 · answered by Dr Spock 6 · 6⤊ 1⤋
remember the simple mathamatic equation DMAS which is "division" "multiplication" "subtraction". When you have a long equation you have to do things in this order. So now since you already have the answer you have to reverse the order and get rid of everything except the Y. Whatever you do on the formula side of the equals sign you do on the answer side also.
a. 3y-2+2=19 + 2
b. 3y=21
c. 3y/3 = 21/3 (division and multiplication)
d. y = 7
2007-01-04 01:07:54 · answer #2 · answered by Knowitall 4 · 4⤊ 0⤋
Add 2 from both sides:
3y=21
y=7
Check:
3(7)-2=19
19=19
2007-01-04 01:06:54 · answer #3 · answered by Anonymous · 4⤊ 0⤋
What you're trying to do is get the y by itself on one side, and a number on the other side. The way to do that is do something to both sides that will get the y alone. Add 2 to both so you have 3y on one side and 21 on the other. So then you divide both sides by 3 so that y is alone, and 21/3 is 7.
2007-01-04 01:04:39 · answer #4 · answered by Jennifer 2 · 3⤊ 0⤋
3y-2=19 Bring 2 to right hand side (Negative become positive)
3y=19+2
3y=21 Bring 3 over to right hand side (Multiplication become Division)
y=21/3
y=7 (Answer)
Substitutes y=7 into equation to confirm answer
3y-2=19
(3x7) - 2 = 19
21-2 = 19
19 = 19
Confirm Answer is y=7
2007-01-04 01:03:23 · answer #5 · answered by cls22cls 2 · 5⤊ 0⤋
You have to get "y" by itself, so add 2 to both sides.
3y-2+2=19+2......3y=21
Now divide each side by 3.
(3y)/3 = 21/3
y=7
2007-01-04 01:05:22 · answer #6 · answered by The Maestro 4 · 5⤊ 0⤋
Add 2 to both sides: 3y=21
Divide both sides by 3: y=7
2007-01-04 00:59:50 · answer #7 · answered by gp4rts 7 · 6⤊ 0⤋
add the two the other side...then divide 19+2 by 3 so in the it will look like this
19+2/3=y
2007-01-04 00:59:54 · answer #8 · answered by annette1911 1 · 4⤊ 0⤋
3y-2=19 original problem
....-2...-2 subtract 2 from each side
3y=17 the result of the subraction
y=17/3 divide both sides by 3
thats the answer! 17/3 divide it with a calculator
2007-01-04 01:03:38 · answer #9 · answered by cppdungeon 2 · 0⤊ 8⤋
[-3y+4x=-19]-1.5*[-2y-3x=-24]
17x/2=17
x=2
-3y+8=-19
-3y=-27
y=9
(2,9)
2007-01-04 01:04:39 · answer #10 · answered by tnbadbunny 5 · 4⤊ 1⤋