8(y-9)+20y=4y-5(30)?

2008-04-05 6:23 pm
solve the equation for y

回答 (21)

2008-04-05 6:43 pm
8y - 72 + 20y = 4y - 150
24y = - 78
y = - 78 / 24
y = - 39 / 12
y = - 13 / 4
y = - 3 ¼
2008-04-05 6:39 pm
8y - 72 + 20y = 4y - 150
= 8y + 20y - 4y = -150 +72
= 24y = -78
4y = -13
y = -13/4
y = - 3.25
2008-04-05 6:37 pm
8y-72+20y=4y-150
28y-4y=72-150
24y=-78
y=-78/24= -3,25
2008-04-05 6:32 pm
8(y - 9) + 20y = 4y - 5(30)
8*y - 8*9 + 20y = 4y - 150
8y - 72 + 20y = 4y - 150
8y + 20y - 4y = 72 - 150
28y - 4y = -78
24y = -78
y = -78/24
y = -3 1/4 (-3.25)
2008-04-05 6:31 pm
8y – 72 + 20y = 4y - 150
28y – 72 = 4y – 150
24y = -78
y = -3.25
2008-04-05 6:31 pm
8(y-9)+20y=4y-5(30)
8y - 72 + 20y = 4y - 150
24 y = -78
y= -13/4

(Ans)
2008-04-05 6:29 pm
8(y-9)+20y=4y-5(30)
First, distribute.
8y - 72 + 20y = 4y - 150
Now, combine like terms.
28y - 72 = 4y - 150
Subtract 4y from each side.
24y - 72 = -150
Add 72 to each side.
24y = -78
Divide both sides by 24.
y = -3.25

Note, the equation you gave is different than 8(y-9)+20y=(4y-5)30, so I hope you gave it correctly.
2008-04-05 6:29 pm
8y-72+20y=4y-150
28y-72=4y-150
(-4y) to both sides
24y-72=-150
(+72)to both sides
24y=-78
(divide each side by 24)
y = - 3.25
2008-04-05 6:33 pm
first you multuply 8 times y and 8 time 9 and you add the both ys on the left side of the equation. so you have 28 y and -72 on the lest side of the equation. on the right side of the equation you multiply -5 times 30 and you get -150. on left side if the equation add 72 to -72 to cancel out and do the same to -150 and you get -78 so you have 28y = 4y -78. subtract 4y from 4y and you get 0 and do the same to 28y and you get 24y=-78. now divide by 24y and do the same to -78 and you get y=? (divide -78 by 24)
2008-04-05 6:31 pm
First, use the distributive property to remove the paretheses. 8(y-9) becomes 8y-72, and 5(30) becomes 150. Now you have the equation 8y-72+20y=4y-150. You can group the y's in the first equation together, giving you 28y-72=4y-150. Add 150 to both sides, because it is easiest. This gives you 28y+78=4y. Subtract 28y from both sides, giving you 78=-24y. Divide both sides by -24, and you get y=-3.25


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