-2x + 4y = 48
x + 4y = 24
A.
x = -8, y = 8
B.
x = 8, y = -8
C.
x = 2, y = 13
D.
x = 8, y = 4

Answer

x=-8

y=8

Step-by-step explanation:

-2x+4y=48...(1)

x+4y=24(2)

From (2) make x the subject of formula

x=24-4y(3)

Substitute (3) into (1)

-2(24-4y)+4y=48

-48+8y+4y=48

Add 48 to both sides

8y+4y=48+48

12y=96

Divide both sides by 12

y=8

Substitute y=8 into (1)

-2x+4(8)=48

-2x+32=48

-2x=48-32

-2x=16

Divide both sides by _2

X=-8

Therefore x=-8 and y=8

A

Step-by-step explanation:

Given the 2 equations

- 2x + 4y = 48 → (1)

x + 4y = 24 → (2)

Subtracting (2) from (1) term by term will eliminate the y- term, that is

- 3x = 24 ( divide both sides by - 3 )

x = - 8

Substitute x = - 8 into either of the 2 equations and solve for y

Substituting in (2)

- 8 + 4y = 24 ( add 8 to both sides )

4y = 32 ( divide both sides by 4 )

y = 8

Solution is x = - 8, y = 8 → A

step-by-step explanation:

hunhgunyt7 in u uuuhiuteu

hello from mrbilldoesmath!

answer:

25x^2 + 90x + 84

discussion:

mn(x) = m(n(x)) = m( 5x + 9) =

(5x + 9)^2 + 3 =>

25x^2 + 90x + 9^2 + 3 =

25x^2 + 90x + 84                 (as 9^2 = 9*9 = 81)

which is the second choice

regards,  

mrb

p.s.   i'll be on vacation from friday, dec 22 to jan 2, 2019. have a great new year!