Solve 10x − 1 = 49

The solution of 10x − 1 = 49 is x = 5.

10x - 1 = 49\ \Rightarrow\ x = 5

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The lines y = 10x − 1 and y = 49 meet at x = 5. The solution of the equation is the x-coordinate of the point where the two sides are equal.

How to work it out

1
The goal is to get x alone. Undo the operations in the opposite order: first the subtraction, then the multiplication.
$10x - 1 = 49$
2
Add 1 to both sides:
$10x - 1 + 1 = 49 + 1 \ \Rightarrow\ 10x = 50$
3
Divide both sides by 10:
$\frac{10x}{10} = \frac{50}{10} \ \Rightarrow\ x = 5$
4
Check: put x = 5 back into the equation.
$10\cdot5 - 1 = 50 - 1 = 49 \checkmark$

LaTeX source of the formulas on this page

\[ 10x - 1 = 49\ \Rightarrow\ x = 5 \]
\[ 10x - 1 = 49 \]
\[ 10x - 1 + 1 = 49 + 1 \ \Rightarrow\ 10x = 50 \]
\[ \frac{10x}{10} = \frac{50}{10} \ \Rightarrow\ x = 5 \]
\[ 10\cdot5 - 1 = 50 - 1 = 49 \checkmark \]

Trying values of x in 10x − 1 = 49

x	10x − 1	Equals 49?
3	29	no
4	39	no
5	49	yes
6	59	no
7	69	no

Questions

What is x in 10x − 1 = 49?

The solution of 10x − 1 = 49 is x = 5.

How do you solve 10x − 1 = 49?

Add 1 to both sides to get 10x = 50, then divide both sides by 10 to get x = 5.

How do I check the answer?

Replace x by 5: 10(5) − 1 = 49, which is 49.

Solve 10x − 1 = 49

How to work it out

Trying values of x in 10x − 1 = 49

Questions

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