1. Determine whether the following is an expression. Yes or No
9 + w = c
2. find the mean
2,8,10,12,13
3. Divide
y 18/ y10
4.solve the system by substitution
x + y = 12
y = 2x
5. solve the system by addition
5x- 3y =13
4x- 3y =11
6. solve
x -7 = 4
2007-09-17 08:19:56 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
2.
2 + 8 + 10 + 12 + 13 = 45
45 /5 = 9
Mean = 9
6.
x - 7 = 4
x = 4 + 7 = 11
x = 11
2007-09-17 08:24:42 · answer #1 · answered by marcscz 2 · 1⤊ 2⤋
solve> 9x - 9 = 8x? x = 9
1. Determine whether the following is an expression. Yes or No, it is an equation
9 + w = c
2. find the mean
2,8,10,12,13 = (2+8+10+12+13)/5 = 9
3. Divide
y 18/ y10 = y^8
4.solve the system by substitution
x + y = 12
y = 2x
x+2x = 12 so x = 4 and y = 8
5. solve the system by addition
5x- 3y =13
4x- 3y =11 --> -4x+3y = -11 <-- Add to 1st equation getting:
x = 2 so 5*2-3y = 13 --> -3y = 3 --> y = -1
6. solve
x -7 = 4 --> x = 4+7 = 11
2007-09-17 08:36:11 · answer #2 · answered by ironduke8159 7 · 0⤊ 0⤋
1) No, it is an equation
2) mean=(2+8+10+12+13)/5=9
3) y^18/y^10=Y^18.y^-10=y(18-10)=y^8
4) x+y=12------------(1)
y=2x ---------------(2)
subsituting for y from (2) in (1),we get
or x+(2x)=12
or3x=12 or x=12/3=4 ans
5) 5x-3y=13-------------(1)
4x-3y=11
-4x+3y=-11------------(2)
adding (1) & (2),we get
x=2, so putting this in(1),we get
5*2-3y=13
or 10-3y=13
or -3y=13-10=3
so y=-1 &x=2 ans
6) x-7=4
or x-7+7=4+7=11 so x=11 ans
2007-09-17 08:42:27 · answer #3 · answered by MAHAANIM07 4 · 0⤊ 0⤋
Great you get the answers for your homework, but you'll never learn anything this way, ask about the method: How can it be worked out?
That way you will learn and will be able to pass an exam on this....!
2007-09-17 08:32:41 · answer #4 · answered by Dan 4 · 0⤊ 1⤋
wow those r easy... im sure you can figure it out.
what class you in? algebra 2?
2007-09-17 08:24:55 · answer #5 · answered by mj 3 · 1⤊ 2⤋
HOmework help?! hah!.. no point of answering these.. soz
2007-09-17 08:23:01 · answer #6 · answered by Ash 2 · 1⤊ 2⤋