7. 4x+y=8 ----- first equation
(+)
-3x-y=0
_______
x = 8 ---- second equation
substitude second equation into first equation
4(8) + y = 8
32 + y = 8
y = 24
8. 2x+5y=20 ---- first equation
(-)
2x-5y =3
________
10y = 17
y = 17/10 ---- second equation
substitude second equation into first equation
2x + 5(17/10) = 20
2x + 17/2 = 20
4x + 17 = 40
4x = 23
x = 23/4
9. 3x+2y=-10 (×2) ---- first equation
2x-5y=3 (×3)
6x + 4y = - 20
(-)
6x - 15y = 9
___________
19y = - 29
y = - 29/19 ---- second equation
substitude second equation into first equation
3x + 2(-29/19) = - 10
3x - 58/19 = - 10
3x = - 132/19
x = - 44/19
Answer:
c
Step-by-step explanation:
A.
pb=4x+2+7x+7+5x-4
pb=16x+5
pp=x+3+x+7+2x-5
pp=4x+5
B.
pb-pp=16x+5-(4x+5)
pb-pp=16x+5-4x-5
pb-pp=12x
C.
pb(3)=16*3+5=53
pp(3)=4*3+5=17
Add 11 and 7
11 + 7
18
Mulitply 1/3 and 18
1/3 * 18
6
1/3 the sum of 7 and 11 is 6.
Answer:
X represents what I'm confused what's the equation
Step-by-step explanation: