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Q: What is 2a - 1 equals 9?

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2a + 9 = 4a - 19 9 + 19 = 4a - 2a 28 = 2a a = 14

2a + 1 = 3subtract 1 from both sides2a = 2divide both sides by 2a = 1

The multiplicative inverse of -2a is 1/(-2a) = -1/2a

A equals 20.

2a -3 means 2 times a minus 3 if a = 2 we have 2 x 2 - 3 = 4 - 3 = 1

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2a - 7 = -9 2a - 7 + 7 = -9 + 7 2a = -9 +7 2a = -2 2a/2 = -2/2 a = -2/2 a= -1

2a + 9 = 4a - 19 9 + 19 = 4a - 2a 28 = 2a a = 14

-2a + 5 = 1 -2a = -5 + 1 -2a = -4 a = -4/-2 a = 2

Simple algebra, 2a-20 = -2 2a=18 a=18/2 a=9

2a + 1 = 3subtract 1 from both sides2a = 2divide both sides by 2a = 1

1

-7a+2a+9 is also -5a+9. -5a+9=24. -5a=15. a=-3.

5a-20+2a = 6a-11 5a+2a-6a = 20-11 1a = 9 a = 9

(4, 3)

It is a linear equation in one variable, a.

2a + 21 = 8a - 9Add 9 to each side:2a + 30 = 8aSubtract 2a from each side:30 = 6aDivide each side by 6:5 = a

If: 2a+13 = 5a+1 Then: a = 4

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