ElectricPavlov

1)    1in/2ft  =  9in/x ft       x =  9 / (1/2) = 18 ft

2)

3)    1 cm / 13 km  =  x cm/130cm     x = 1/13 x 130 = 10 cm

4)

I'll let you work on 2 and 4

Do you have the pH ?

LOL.....but I am often wrong !   HaHa!   G'Day !

x = 5% amount                                Interest after 1 year =  (.05) x

1500-x = 4 percent amount             Interest after 1 year = ( .04) (1500-x)

   Added together they equal 69.50

(.05)x + (.04) (1500-x) = 69.50

.05x + 60 - .04x = 69.50

x= $950  at 5%

4% amount = 1500 - x = 1500 - 950 = $550

As an afterthought, you do o not have to change it to y = mx+b form

x = o    gets y axis intercept   0 +5y = 10       y = 2  = intercept

y=o      gets x axis intercept   x + 5(0) = 10    x = 10 = x axis intercept....

Either way works !   D'Oh !

Here it is:

It is the equation of a line....when x= 0  you will find the y-axis intercept when in y=mx+b form

x + 5y = 10

5y= -x +10

y = - 1/5 x + 2  

y= -1/5 (0) + 2      y intercept = 2

when y = 0 you will get the x-axis intercept

 0 = -1/5 x + 2       x intercept = 10  

Plot those points and draw a lint through them....  ta da!   done!   I will get a picture in just a sec...

You are very welcome,    Thanx !

You got 33.02 cm     33.02 cm / 100cm/m = .3302 meters

y=mx+b       where  m = -4/3  and point  6, -8

-8 = -4/3 (6) + b        solve for b

b = -8+4/3*6 = 0

y = -4/3 x + 0    or just    y= - 4/3 x