Question

what value of x makes this equation true? -90=100+× A. -10 B. 10 C. -190 D. 190

Answer 1

The equation is:

$-90=100+x$

We need to find the value of x which makes this equation true.

It is very simple! When we have an equation, to solve for the variables, the first step is to put variables to one side and numbers to another. Remember,

side change = sign change

Thus, we have:

$\begin{gathered} -90=100+x \\ -90-100=+x \\ We\text{ can write it as:} \\ x=-90-100 \\ x=-190 \end{gathered}$

Correct Answer:

C