Solve by substitution8x-8y= -8, 3x+19= y?

Question

30 questions due in 1 hour

Answer 1

x - y = - 1
x - (3x + 19) = - 1
- 2x - 19 = - 1
2x + 19 = 1
2x = - 18
x = - 9

-9 - y = - 1
9 + y = 1
y = - 8

x = - 9 , y = - 8

Answer 2

Substitute y=3x+19 into the other equation for y. So instead of 8x-8y= -8 it would be 8x-8(3x+19)= -8. Distribute the -8 across the parentheses to get 8x-24x-152= -8. Simplify to
-16x-152= -8 and then to -16x=144. So x= -9. Then substitute the x value into either of the equations. The second would be easier since it is already simplified to y. So 3(-9)+19=y, then
-27+19=y, y= -8.

Answer 3

I won't do your math for you, but since it wishes substitution, you have one of those equations already in Y. so take that (3x+19) and put it where the Y is in the first equation, and solve it for Y.

It looks like this:

8x - 8(3x+19) = -8
solve this for x, then sutstitute either equation, to find y. The check is to see if they both will work in both equations. If they don't, you made a mistake... and if you get a fraction, you probably made a mistake in math somewhere... they are not trying to make you do lots of arithmetic, they are trying to teach you a method and to be neat...And you are dead in the water if you are messy. This stuff is easy... it gets really bad, and you get truly lost of your numbers are all over the page.... I promise.

Answer 4

8x-8y= -8
8(x-y)= -8
x-y=-1 [dividing both sides by8]
From equation 2 we get y=3x+19
Substituting 3x+19 fr y in x-y=1,we get
x-3x-19=1
-2x=1+19=20
x= 20/-2=-10
Plugging x in 3x+19=y.we get
3*-10+19=y
-30+19=y
y= -11

Answer 5

8x-8(3x+19)= -8
8x-24x-152=-8
-16x=144
x=-9

3( -9)+19=y
y= -8