Henry was thinking of a number. Henry doubles it and gets an answer of 4. What was the original number?

Let x be the number Henry is thinking of.

The number is doubled and got an answer of 4.

That means:

2 · x = 4

or

2x = 4

This is the equation when Henry doubled the number and got 4 as an answer.

Solve it by dividing both sides by 2.

2x ÷ 2 = 4 ÷ 2

x = 2

The original number Henry was thinking was 2.

Cheers!

the equation for this situation is y=122+45. to solve the equation you would add 45 and 122 to get a total of 167lbs. in conclusion, grace's weight eight weeks ago was 167lbs.  

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,