Question

Y = –3x + 6

y= 9

What is the solution to the system of equations?

(–21, 9)

(9, –21)

(–1, 9)

(9, –1)

Answer 1

since y is 9, we can just sub it in the first equation,
9 = -3x + 6
3 = -3x
x = -1
so the answer is the third one

Answer 2

(-1,9)

Explanation:

`y = -3x + 6`

`y= 9`

To find out the solution we substitute the value of y in the first equation

given y =9

we plug in 9 for y in the first equation
`y = -3x + 6`

`9 = -3x + 6`

Subtract 6 on both sides

`9-6 = -3x + 6-6`

`3 = -3x`

Now divide both sides by -3

`x=-1`

The value of
`x=-1, y=9`