I don't know how to work this problem out

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14-02-2017
Mathematics

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I don't know how to work this problem out

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When h has the value of 3 calculate 9h 5

matthewsmart9 matthewsmart9 · Answer 1 · 2017-02-15T00:21:21-05:00

1/5(x-y) = 1
x+y = 9

x-y = 5 (x5)
x+y = 9

First you want to create both equations so at least one of the variables (x or y) are the same in both equations, so that is why I multiplied the top one by 5, you multiply the whole equation (both sides)

2x = 14
x = 7

Then you either Plus or minus one from the other, I plused the top one onto the bottom one, then solved for x

7 + y = 9
y = 2

Then put x back into one of the first two equations to get Y