Question

if 7z + 3z =18 then find z​

Answer 1

Answer:

The correct answer is z = 1.8

Step-by-step explanation:

Given equation is 7z + 3z = 18

3z and 7z have the same coefficient, hence they are added, and we get

$3z + 7z \: = 18\\ 10z \: = 18 \\ z = \frac{18}{10} \\ z = 1.8$

Hence, the value of z is 1.8 or 9 /5.

The above equation is linear where the variable is z and we use some properties of linear equations to reach at the correct answer.

In the first step, the coefficients of z are added and then, in the next step, both the sides of equations are divided by 10 and then we arrive at the result that z = 9/5 or 1.8

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Answer 2

Answer:

The value of z is 9/5.

Step-by-step explanation:

Steps to find the value of z:-

• Group the like terms on the one-side.
• Now, add all the like terms.
• Finally, solve for z.

Step 1 of 3

Consider the given expression as follows:

7z + 3z = 18

Observe that all the terms of z are already grouped on the left-hand side.

Step 2 of 3

Add the like terms 7z and 3z as follows:

⇒ 10z = 18

Step 3 of 3

Solve the expression to find the value of z.

Divide both the sides by the number 10.

⇒ 10z/10 = 18/10

⇒ z = 9/5

Final answer: The value of z is 9/5.

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