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+8x=45, x=6#

Like this:

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

#x+#

"and eight times a number":

#x+8x#

"is 45":

#x+8x=45#

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

#9x=45#

then divide both sides by 9:

#(9x)/9=45/9#

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