8X + 6Y+4

Y=-3X+9

using substitution what numbers are the variables X and Y

(5,6)

Step-by-step explanation:

8X + 6Y=4

Y=-3X+9

Substitute the second equation into the first. Every place you see y put - 3x+9)

8x + 6 (-3x+9) = 4

Distribute

8x-18x + 54 = 4

Combine like terms

-10x + 54 = 5

Subtract 54 from each side

-10x + 54-54=4-54

-10x = - 50

Divide by - 10

-10x/-10 = - 50/-10

x = 5

Now we need to find y

y = - 3x+9

y = - 3 (5) + 9

y = - 15+9

y = 6

(5,6)