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3 years ago

X+2y=3 x-y=3 x=? y=?

Mathematics

1 answer:

alexgriva [62]3 years ago

7 0

Answer:

x = 3

y = 0

Step-by-step explanation:

x + 2y = 3 ---------eqn 1

x - y = 3 --------eqn 2

Using eqn 2 to find the value of y

x - y = 3

Making y the subject of the formula

x - 3 = y

y = x - 3

Substitute the value of y into eqn 1

x + 2y = 3

x + 2(x - 3) = 3

Open the bracket

x + 2x - 6 = 3

3x - 6 = 3

3x = 3 +6

3x = 9

Divide both sides by 3, to get value of x

3x/3 = 9/3

x = 3

To get the value of y, use eqn 2

x - y = 3

3 - y = 3

3 - 3 = y

y = 0

Hint, to know maybe the values are correct, insert the values into the equation

Let's use eqn 2

x - y = 3

x = 3

y = 0

Insert into the equation

x - y = 3

3 - 0 = 3

Our values are correct

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