Question

medal and fan \


What value of x makes the equation true?
–8.6 = –4.1 + x
A.
–12.7
B.
–4.5
C.
4.5
D.
12.7

Answer 1

@phi

Answer 2

if you want -4.1 to "disappear" what should you add to the right side ?

Answer 3

-8.6 - -4.1

Answer 4

or just add 4.1
-8.6 + 4.1 (which is the same thing as -8.6 - -4.1)

to simplify, ignore the signs (for the moment) and subtract the smaller number from the bigger. then assign the sign of the bigger number to the answer.

Answer 5

-4.5 b

Answer 6

yess!

Answer 7

you can always check the answer:
try x= -4.5 in the problem
\[- 8.6 = -4.1 + x\\
-8.6 = -4.1 + -4.5 \]