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Q: Evaluate 7a if a equals 6?

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555

3a + 4a +/- 6; take the 3a & 4a and combine them; 7a +/- 6 would be your answer as 6 cannot combine with 7a due to the variable. If 7a +/- 6 = 0, then subtract/add (respectively) the 6 depending on the operation. Therefore 7a + 6 = 0 turns to 7a = -6. Divide the 7 with the -6 to get the a alone; a = -6/7 or -0.8. Cannot be simplified.

7a + 6 = -36 Subtract 6 from both sides: 7a = -42 Divide both sides by 7: a = -6 a = -6

The variable is a. You can solve for it, like this: 8a - 9 = 7a - 6 8a = 7a + 3 8a - 7a = 3 a = 3

4a-2=7a-6 4=3a a=4/3

a + 18 = 7a a-a +18 = 7a-a 18 = 6a 18/6 = 6a/6 3 = a 3=a

7a-17 = 4a+1 7a-4a = 1+17 3a = 18 a = 6

6

Collect like terms: 9a -7a = 9 - 15, ie 2a = -6, so a = -3

3 6

4a

14

(7a=3)=(-a-5)=16

D = 210

9a-a = 19+7a 8a = 19+7a 8a - 7a = 19 + 7a - 7a 1a = 19 a = 19

find out what 6 squared equals. which is 6 x 6 and that equals 36

15z = 15 x 6 = 90

a = 4

It is: 9a-a-a = 7a

x=y-8 z=x+12

6 + 12 - 5 = 13

33

4a - 5 = 7a - 7 -5 = 3a - 7 2 = 3a a = 3/2

pq-r, if p is 3, q is 4, and r is -6 is equal to 3 x 4 - (-6), which is equal to 12 + 6, which is equal to 18.

7a=2(-10)........................................answer is 20/7