Question

5x-2y=30

Complete the missing value in the solution to the equation.
(8,_)

Answer 1

The answer to this question is
`5`.

Explanation:

Here
`(8, \_ )` means the values of
`(x,y)`.

`\Rightarrow x = 5` and we have to find the value of
`y`.

Putting the value
`x =5` in the equation
`5x-2y = 30`

`\Rightarrow 5* x - 2 * y = 30\\\Rightarrow 5 * 8 - 2 * y =30\\\Rightarrow 2 * y = 40-30\\\Rightarrow 2 * y = 10\\\Rightarrow y = 5`

Hence the answer is
`(8,5)`.

Answer 2

5

Explanation:

We are given an x coordinate of the solution, so we can substitute 8 in for x

5x-2y=30

5(8)-2y=30

Multiply 5 and 8

40-2y=30

To solve, we need to get y by itself. First, move all the numbers to the same side of the equation

To do this, subtract 40 from both sides

40-40-2y=30-40

-2y= -10

y is still not by itself, it is being multiplied by -2 . To undo this, divide both sides by -2

-2y/-2= -10/-2

y=5

So, the missing value is 5