Solve 7x + 2 = 79

The solution of 7x + 2 = 79 is x = 11.

7x + 2 = 79\ \Rightarrow\ x = 11

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The lines y = 7x + 2 and y = 79 meet at x = 11. 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 addition, then the multiplication.
$7x + 2 = 79$
2
Subtract 2 from both sides:
$7x + 2 - 2 = 79 - 2 \ \Rightarrow\ 7x = 77$
3
Divide both sides by 7:
$\frac{7x}{7} = \frac{77}{7} \ \Rightarrow\ x = 11$
4
Check: put x = 11 back into the equation.
$7\cdot11 + 2 = 77 + 2 = 79 \checkmark$

LaTeX source of the formulas on this page

\[ 7x + 2 = 79\ \Rightarrow\ x = 11 \]
\[ 7x + 2 = 79 \]
\[ 7x + 2 - 2 = 79 - 2 \ \Rightarrow\ 7x = 77 \]
\[ \frac{7x}{7} = \frac{77}{7} \ \Rightarrow\ x = 11 \]
\[ 7\cdot11 + 2 = 77 + 2 = 79 \checkmark \]

Trying values of x in 7x + 2 = 79

x	7x + 2	Equals 79?
9	65	no
10	72	no
11	79	yes
12	86	no
13	93	no

Questions

What is x in 7x + 2 = 79?

The solution of 7x + 2 = 79 is x = 11.

How do you solve 7x + 2 = 79?

Subtract 2 from both sides to get 7x = 77, then divide both sides by 7 to get x = 11.

How do I check the answer?

Replace x by 11: 7(11) + 2 = 79, which is 79.

Solve 7x + 2 = 79

How to work it out

Trying values of x in 7x + 2 = 79

Questions

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