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# solve by substitution method?

4x+7=48

-4x+y=16

not sure how I am doing this. but the answer is wrong.

pleas help

### 2 Answers

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- TomVLv 71 decade agoFavorite Answer
Shouldn't that first equation be "4x+7y=48"?

IF so, add the two equations to get:

8y = 64

from which y = 8

substituted into the first equation gives

4x + 56 = 48

or

x = -2

...

- Charlie DLv 41 decade ago
You can work out what x = from the first equation

4x + 7 = 48

4x = 41

x = 41/7

Now it substitute it into the second one instead of x:

-4x + y = 16

y - 4(41/7) = 16

y = 16 + 4(41/7)

y = 39.43 (4sf)

Hmm yeah I think tom may be right that you meant 4x + 7y = 48....fml

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