How do you write as a mathematical expression and solve: The sum of a number and 8 times the number is 45?

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Answer 1 · 2016-11-12T00:21:32

$x + 8 x = 45, x = 6$ $x+8x=45, x=6$

Like this:

"The sum of a number (which I'll call $x$ $x$ )":

$x +$ $x+$

"and eight times a number":

$x + 8 x$ $x+8x$

"is 45":

$x + 8 x = 45$ $x+8x=45$

and now we solve, first by adding the x-terms together:

$9 x = 45$ $9x=45$

then divide both sides by 9:

$\frac{9 x}{9} = \frac{45}{9}$ $(9x)/9=45/9$

$(cancel9x)/cancel9=45/9=(6xx9)/9=(6xxcancel9)/cancel9=6$