math problems?

Question

help!!!!!!!!!! now!!!!!!!! please!!!!!!

1.) Solve the equation 5x+11= -2x+7 for X

2.) If 4 x+35=49.8, then 7 x=?

3.)name y-intercept and slope of y= -2x+4

4.)price rose from $2.10 to $2.52 what is percentage of increase?

LAST ONE IS HARDDDD

The formula in the b0x below is showing how 2 convert a fahrenheit t0 celsius temperature
c=5 over 9 times(F-32)
show how c=5/9(F-32) can be made so that F stands alone on the left side of formula

Thanz 4 ur help i had to do sum homework and these are the only problems i didnt understand (p.s its says shows all work so if you can show me how to do them please thanx)

Answer 1

5x+11= -2x+7
-5x+11=-5x+7
----------------------
.......11=-7x +7 Subtract 5x from both sides

11=-7x+7
-7 ....... ..-7 Subtract 7 from boths sides (remember trying to get X by itself)
----------------
4= -7x

4= -7x

divide both sides by -7

x= -4/7


Check your answer by plugging it back into the problem. When you check it both sides of the problem should equal 8 1/7.


Next problem. Number 2


4x+35=49.8
....-35=-35 Subtract 35 from both sides.
---------------------
4x=14.8 Now dive both sides by 4

x= 3.7

If x=3.7, then 7x= 25.9

3rd problem. m= -2 (slope) b= 4 (y-intercept) The slope is just the number in front of x in the problem. They y-intercept is the number after the slope and x, it can be positive or negative, as well as the slope.





Number 4

With percent of increase you hust first find the difference between the two prices. 2.52-2.10 (it doesn't matter what order you subtract them, the other way will make it negative, but it is actually understood to be positive)

So your difference is 42 cents. So now you divide this by the original price... SInce you want to know the percent of increase from the original. Remember to add the decimal for the 42 cents since it is change.

.42/2.10 ..................................................= .2 Since this is percent it is understood to be a 20% increase.


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Number 5

This problem is not as hard as you think. Think about in the problems above when you are trying to get "x" by itself. You added divided mulitplied to do this right....

Well same thing here. This time you just want to get f by itself.

C=5/9(F-32)

First multiply both sides by 9/5 since, you want to cancel out the 5/9 that is front of (f-32)

9/5 x C= 5/9(F-32) x 9/5

You now have.

9/5C=F - 32

Remember the 5/9 and 9/5 canceled out to one, son now (F-32) is by itself.


So now since you have

9/5C=F - 32

Add 32 to both sides (remember you are trying to get "F" by itself)


..9/5C.....=F-32
.......+32=...+32
--------------------
9/5C+32=F

or

F=9/5C+32

See now that hard if you still have questions Im me. I will be on all night.

Answer 2

1.) 5x + 11 = -2x + 7
7x = -4
x = -4/7

2.) 4x + 35 = 49.8
4x = 14.8
x = 3.7, so 7x = 25.9

3.) y = mx + b where m is slope and b is y intercept
m = slope = -2, b = y intercept = 4

4.) (new - old) / old
2.52-2.10/2.10 x 100%
= 20% increase

5.) c = (5/9)(F-32) multiply both sides by 9/5, leaving
(9/5)c = F - 32 add 32 to both sides, leaving
(9/5)c + 32 = F

Answer 3

1st one is x - -4/7

2nd is x= 3.7, so 7x = 25.90

3rd is the slope is -2 and the y-intercept is 4 (you can tell by looking at that one cause it's in the "slope-intercept" form "y = mx + b", where M is the slope and b is the y-intercept. .

and the last one is (unless I did something wrong):

F = 5/9C +32