Select all of the equations equivalent to 6x=42.

A x−7=0
B 4x2=14
C x−1=8
D 6x−1=23

x-7=0

Step-by-step explanation:

We have two different methods to solve this question and we will still arrive at the same answer

The first method is

6x=42

Let'sdivide both sides by 6

x=7

Substrate 7 from both sides

x-7=0

The second method is

6x=42

Substrate 42 from both sides

6x-42=0

Factorise

6(x-7)=0

6=0

X-7=0

Therefore the final answer is x-7=0

A)

Step-by-step explanation:

FIRST ANSWER CHOICE:

is equivalent to .

Mutiply both sides by 6:

SECOND ANSWER CHOICE:

The equation , there is no symbol to seperate and so I can guess it is mutiplication or . That is not the answer

THIRD ANSWER CHOICE:

The equation x - 1 = 8 cannot be the

x - 1 = 8

FOURTH ANSWER CHOICE:

The equation cannot be the

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6