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Question 41719: Could you help me with a formulas to solve the following problems:
-4x+2 =42
3+2x+6x=3
-18=x-6
Answer by tutorcecilia(2152)   (Show Source):
You can put this solution on YOUR website! This problem involves solving or isolating the "x". First try to combine all like-terms, than simplify. Next, use either addition or subtraction first to get rid of a term. Lastly, use division or multiplication to get rid of any remaining terms.
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Be sure to check your answer in case the x value is incorrect.
-4x+2 =42
-4x + 2 - 2 = 42 - 2
-4x = 40
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-4x/-4 =40/-4
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x = -10
Check your answer by plugging x = -10 back into the orignal problem:
-4x+2 =42
-4(-10) + 2 = 42
40 + 2 = 42
42=42 the answer checks out.
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3+2x+6x=3
Combine all like-terms
3+8x=3
3-3 + 8x = 3 - 3
8x = 0
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8x/8 = 0/8
x = 0
Remember that zero divided by any number will equal zero. Example 0/4 = 0.
But you cannot DIVIDE by zero. Example: 8/0 = undefined.
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Check your answer of x = 0
3+2(0)+6(0)=3
3 + 0 + 0 = 3
3=3 The answer checks out.
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-18=x-6
-18 +6=x-6+6
-12 = x
Check your answer of -12 = x
-18=(-12)-6
-18 = -18 Checks out!
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