Question

If you were to use the substitution method to solve the following system, choose the new equation after the expression equivalent to y from the first equation is substituted into the second equation.
8x - y = -9
4x - 3y = -22

(a)4(-8x - 9) - 3y = -22
(b)4x - 3(-8x - 9) = -22
(c)4(8x + 9) - 3y = -22
(d)4x - 3(8x + 9) = -22

Answer 1

IN A HUGE HURRY. ANSWER PLEASEEEE.

Answer 2

To perform a substitution, you have to isolate of of the variables,
the y in the first equation is the easiest to isolate

what is y = ?

Answer 3

to isolate y

from the equation
8x - y = -9

add y to both sides and also add 9 to both sides

what do you get?

Answer 4

. . .

Answer 5

@ElijahM

Answer 6

Im lost....

Answer 7

y=9?

Answer 8

8x - y = -9

adding y to both sides

8x - y + y = -9 + y

the left hand side simplifies

8x = -9 + y

now add 9 to both sides

8x +9 = -9 + y + 9

now the right hand side simplifies

. . .

Answer 9

soooo 8x+9=y would be it?

Answer 10

good work you have isolated y; (y = 8x+9)

now look at the second equation

4x - 3y = -22

substitute (y = 8x+9) into this equation

what do you get ?

Answer 11

4x-3(8x+9) being answer D?! (:

Answer 12

dont forget the [= - 22] part

but
Great work ! you've done it \(\color{red}\checkmark\)

Answer 13

Thank you Thank you! (: I understand now lol

Answer 14

\[\ddot\smile\]