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# hard question

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4*7y+9+1=10

Guest Aug 31, 2017
#1
+6
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4*7y+9+1=10

10

-  1

-  9

--------

0

so then get 4*7y to 0 (so y = 0.....giving you 4*7y......4*(7*0).......4*(0)....0)

so y = 0

I could be wrong, but it may be right

ctyler009  Aug 31, 2017
#2
+1847
0

$$4\times7y+9+1=10$$

$$28y+9+1=10$$

$$28y+10=10$$

$$28y+10-10=10-10$$

$$28y+0=10-10$$

$$28y=10-10$$

$$28y=0$$

$$\frac{28y}{28}=\frac{0}{28}$$

$$\frac{1y}{1}=\frac{0}{28}$$

$$1y=\frac{0}{28}$$

$$y=\frac{0}{28}$$

$$y=0$$

Now put the answer you came up with and put back into the original equation and solve to see if the answer you came up with is the correct answer.

$$4\times7y+9+1=10$$

$$4\times7\times0+9+1=10$$

$$28\times0+9+1=10$$

$$0+9+1=10$$

$$9+1=10$$

$$10=10$$

Because you came up with $$10=10$$, that means that $$y=0$$ is the correct answer.

gibsonj338  Aug 31, 2017

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