so its y=300+5.5x
y=40
2006-09-17 05:30:16 · 11 answers · asked by Exclusive [♥] 6 in Science & Mathematics ➔ Mathematics
whAT HAPPENS TO THE 5.5??
2006-09-17 05:39:43 · update #1
use substitution. you put 40x in place of y in the first equation.
so you get
40x=300+3x
add -3x to both sides so that you have x's on one side and real numbers on the other
which would make it
37x=300
then divide both sides by 37
because 37 does not evenly go into 300, just leave it in an unsimplified fraction
so x is
300/37
to find y our miltiply that number by 40
this is a yucky answer
12000/37
so yeah, you can make those diecimals if you like.
2006-09-17 05:36:05 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Always check your work. If you insert y=40 into the second equation, you get x=1. If you insert x=1 into the first equation, you get y=303--a contradiction because y cannot be both 40 and 303 at the same time. So, you did something wrong.
You could try substitution. The second equation gives x=y/40. Insert this into the first equation to get y=300+3y/40. This gives (y-3y/40)=300 or 37y/40=300. Multiply both sides by 40/37 to get y=300 (40/37). You then just do the arithmetic.
Once you have y, x is easy to find by substituting y into the second equation.
[Where did you get the 5.5? Note that y=300+5.5x contradicts the first equation y=300+3x. When solving math problems, just be patient, and follow the rules, one by one, step by step. Do only what you are taught to do. Do not invent rules.]
2006-09-17 12:40:18 · answer #2 · answered by Anonymous · 0⤊ 0⤋
if ur question is y=300 +3x , and y =40x
it will be so easy 300 +3x=40x
so x= 300/37 and y =40*300/37
but if ur question is y=300+3xy=40x with y=300+5.5x and y=40
it will be
300+3xy-40x=300+5.5x then y= 40
(3*40)x-40x-5.5x=0 i don know may b u should be more spacified
2006-09-17 12:52:34 · answer #3 · answered by Andromeda 2 · 0⤊ 0⤋
40x=300+3x
40x-3x=300
37x=300
x=300/37
y=40 X 300/37
2006-09-17 12:38:07 · answer #4 · answered by Sai♥Pranav 3 · 0⤊ 0⤋
Algebra HW, eh?
y=300+3x
y=40x
40x=300+3x
37x=300
x=300/37
2006-09-17 12:32:55 · answer #5 · answered by mr cheese 3 · 0⤊ 0⤋
since both expressions are equal to y, equate them as in:
300+3x=40x
subtracting 3x on both sides, 300=37x
or x=300/37
and y=40*300 / 37
work out the arithmetic
2006-09-17 12:32:56 · answer #6 · answered by Ra.Ge 3 · 0⤊ 0⤋
put 300+3=303 times 40 and thats your answer
2006-09-17 12:33:06 · answer #7 · answered by E.T 1 · 0⤊ 0⤋
it is easy . instead of "y" in the first one put 40x and then move the 3x to the left . it will be 37x=300
and then x=300/37 ! i guess you can do the rest !! good luck and do your homework on your own !
2006-09-17 12:38:00 · answer #8 · answered by arash 3 · 0⤊ 0⤋
40x=300+3x
That's all you get. do your own homework.
2006-09-17 12:31:43 · answer #9 · answered by thesweetestthings24 5 · 0⤊ 0⤋
You tell us
2006-09-17 12:31:12 · answer #10 · answered by Anonymous · 0⤊ 0⤋