Question

4k-3=2k+5
4k-3-2k=2k+5-2k
2k-3=5
2k-3+3=5
2k=8
2k/2=8/2
k=4
but how do i justify it??????????????????

Answer 1

Plug k = 4 back into the original equation and evaluate



4k-3=2k+5


4(4)-3=2(4)+5


16-3=8+5


13=13



Since the last equation is true, this verifies the answer.

Answer 2

well the paper says like
a.
b.
c.
d.
e.
f.
how do i put it into that

Answer 3

well they expect 6 lines, but somehow I got the check in 4....hmm

Answer 4

maybe something like


a. 4k-3=2k+5


b. 4(4)-3=2(4)+5


c. 16-3=2(4)+5


d. 16-3=8+5


e. 16-3=8+5


f. 13=13

Answer 5

does that help?

Answer 6

hey what about 2(8u+2)=3(2u-7)
16u+4-6u-21
16u+4-6u=6u-21-6u
10u=4=(-21)
10u+4-4=(-21)-4
10u=-25
10u/10=-25/10
u=2.5

Answer 7

Answer should be -2.5 or -5/2


Is that what you really meant?