okay I cannot get these! Please help and Please show me what you did to get the answer
1. find the value of N if 321.5 =16N - 25.5
2. y=x -15
a. find y if x = 9.4
b. Find x if y=29
3. y =10 - 2.5x
a. find y if x =3.2
b. Find x if y = 85
4. y = 5x - 15
a. find y if x = 1
b. find x if y = 50
2007-10-29 14:59:27 · 3 answers · asked by mollyxxx 2 in Education & Reference ➔ Homework Help
1. 321.5 =16N - 25.5
321.5 + 25.5 = 16N
347 = 16N
347/16 = N
2. y=x -15
a. find y if x = 9.4
y = 9.4 - 15 = -6.6
b. Find x if y=29
29 = x - 15
44 = x
3. y =10 - 2.5x
a. find y if x =3.2
y = 10 - 2.5*3.2 = 10 - 8 = 2
b. Find x if y = 85
85 = 10 - 2.5x
2.5x = -75
x = - 30
4. y = 5x - 15
a. find y if x = 1
y = 5*1 - 15
y = -10
b. find x if y = 50
50 = 5x - 15
65 = 5x
13 = x
2007-10-29 15:09:22 · answer #1 · answered by Steve A 7 · 1⤊ 0⤋
1) add 25.5 to both sides to get rid of the "-25.5":
321.5+25.5=16N-25.5+25.5 Addition Property of Equality
347=16N Property of Opposites
divide both sides by 16 (or mult by 1/16):
(1/16)(347)=(16n)(1/16) Division Prop. of Equality
n=21.6875 (i used a calc, so i got a decm)
do the rest on your own.
2007-10-29 15:06:37 · answer #2 · answered by Anonymous · 0⤊ 0⤋
On 1, add 25.5 to both sides then divide by 16
On 2a, do 9.4 - 15
On 2b, add 15 to both sides (29 + 15)
Others are similar
2007-10-29 15:04:26 · answer #3 · answered by hayharbr 7 · 0⤊ 1⤋