Question

The solution to 4.2x = 19.32 is x = ___. (3 points)


0.28

0.45

4.6

15.12

Answer 1

\(\large\rm 4.2*\color{orangered}{x}=19.32\)

Hmm well we know this from our times table,
\(\large\rm 4*\color{orangered}{5}=20\)

So maybe x is somewhere around the value 5, ya?

Answer 2

If you prefer to do it algebraically:
Notice that the 4.2 is `multiplying` the x.
So in order to isolate x, we'll perform the `opposite of multiplication`,
we'll `divide` both sides by 4.2\[\large\rm x=19.32\div4.2\]