SOLUTION: For my homework, I need step by step instructions. Point slope form for this problem (-2,1); m=-2 Next problems: Write the equation for: What number should be added to -6

Question 1109070: For my homework, I need step by step instructions.
Point slope form for this problem (-2,1); m=-2
Next problems:
Write the equation for: What number should be added to -64 to get -70.
Write the equation for: -64 times a number minus 70 is equal to -14 less than the number.
If the formula for the circumference of a circle is: C=2PIr, r(radius) would equal= (Show work to get "r" alone):
Solve for "x" in the inequality: -3(2x-5)< 3 (x-1)
Thank you so much for your help!

Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
Point slope form for this problem (-2,1); m=-2
The point/slope form y - y1 = m(x-x1)
in this problem
x1=-2; y1=1; m=-2
y - 1 = -2(x-(-2))
y - 1 =-2(x+2)
:
Write the equation for: What number should be added to -64 to get -70.
x - 64 = -70
Write the equation for: -64 times a number minus 70 is equal to -14 less than the number.
-64x - 70 = x - 14
:
If the formula for the circumference of a circle is: C=2PIr, r(radius) would equal= (Show work to get "r" alone):

divide both sides by

:
Solve for "x" in the inequality:
-3(2x-5)< 3 (x-1)
distribute the 3
-6x + 15 < 3x - 3
subtract 3x from both sides
-6x - 3x + 15 = -3
-9x + 15 < -3
subtract 15 from both side
-9x < -3 - 15
-9x < -18
get rid of the neg, multiply by -1, this reverses the inequality sign
9x > 18
x > 18/9
x > 2
You can check the solution in the original equation, replace x with a number greater than 2
See if it is true
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