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Solve 10x + 1 = 21

The solution of 10x + 1 = 21 is x = 2.

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The lines y = 10x + 1 and y = 21 meet at x = 2-4-22468-40-2020406080x = 2y = 10x + 1y = 21
The lines y = 10x + 1 and y = 21 meet at x = 2. The solution of the equation is the x-coordinate of the point where the two sides are equal.

How to work it out

  1. 1

    The goal is to get x alone. Undo the operations in the opposite order: first the addition, then the multiplication.

    10x+1=2110x + 1 = 21
  2. 2

    Subtract 1 from both sides:

    10x+1−1=21−1 ⇒ 10x=2010x + 1 - 1 = 21 - 1 \ \Rightarrow\ 10x = 20
  3. 3

    Divide both sides by 10:

    10x10=2010 ⇒ x=2\frac{10x}{10} = \frac{20}{10} \ \Rightarrow\ x = 2
  4. 4

    Check: put x = 2 back into the equation.

    10⋅2+1=20+1=21✓10\cdot2 + 1 = 20 + 1 = 21 \checkmark
LaTeX source of the formulas on this page
\[ 10x + 1 = 21\ \Rightarrow\ x = 2 \]
\[ 10x + 1 = 21 \]
\[ 10x + 1 - 1 = 21 - 1 \ \Rightarrow\ 10x = 20 \]
\[ \frac{10x}{10} = \frac{20}{10} \ \Rightarrow\ x = 2 \]
\[ 10\cdot2 + 1 = 20 + 1 = 21 \checkmark \]

Trying values of x in 10x + 1 = 21

x10x + 1Equals 21?
01no
111no
221yes
331no
441no

Questions

What is x in 10x + 1 = 21?

The solution of 10x + 1 = 21 is x = 2.

How do you solve 10x + 1 = 21?

Subtract 1 from both sides to get 10x = 20, then divide both sides by 10 to get x = 2.

How do I check the answer?

Replace x by 2: 10(2) + 1 = 21, which is 21.

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    Solve 10x + 1 = 21: x = 2 (steps and check) | WordGPT