Solve this problem by writing and solving an inequality. 7 more than four times a number is less than -40

1 answer

Let's define the variable for the unknown number as \( x \). The phrase "7 more than four times a number" can be mathematically expressed as:

\[ 4x + 7 \]

According to the problem, this expression is less than -40. Therefore, we can set up the inequality:

\[ 4x + 7 < -40 \]

Now, we will solve the inequality step-by-step.

  1. Subtract 7 from both sides:

\[ 4x < -40 - 7 \]

\[ 4x < -47 \]

  1. Now, divide both sides by 4:

\[ x < \frac{-47}{4} \]

  1. Simplify the fraction:

\[ x < -11.75 \]

Therefore, the solution to the inequality is:

\[ x < -11.75 \]

This means that any number less than -11.75 satisfies the original condition.