# math grade nine

posted by .

can someone please tell me if this answer is correct
p-3+2p-9=0
p+2p-3-9=0
3p-12=0+12=0
3p/3 = 12/3 p=4

• math grade nine -

Yes, it's correct.

You can prove it by substituting 4 for p in the original problem.

• math grade nine -

Ms Sue, Can you explain how you substitute the 4 for the p. I'm not sure if I have to add 2with the 4 or do I multiply 2 with the 4.
4-3+2( 4) -9 +0

• math grade nine -

Multiply 2 * 4. The expression 2p means 2 times p.

p-3+2p-9=0

4 - 3 + 8 - 9 = 0

12 - 12 = 0

• math grade nine -

THANKS FOR ALL THE HELP!!!! :)

• math grade nine -

You're welcome.

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