Q9-10 PLEASE HELP ME IM BEGGING

Step-by-step explanation:

4x-4y=-4

x-2y=-5 multiply second equation by 4

4x-4y=-4

4x-8y=-20 subtract the two equations to eliminate x

4x-4y-4x-(-8y)=-4-(-20)

4y=16

y=16/4=4

substitute y in : x-2y=-5

x-2(4)=-5

x=-5+8

x=3

check : (3,4)

4(3)-4(4)=-4

12-16=-4 ( correct)

Q10): 2a-b+c=-2

a-b=-7

2a+b=-2

substitite (2a+b)=-2 in the equation:

2a-b+c=-2

-(2a+b)+c=-2

-(-2)+c=-2

2+c=-2

c=-2-2

c=4

a-b=-7 or a=b-7

substitute in 2a+b=-2

2(b-7)+b=-2

2b-14+b=-2

3b=-2+14

b=12/2=6

a-b=-7 (b=6)

a-6=-7

a=-1

a=-1, b=6, c=4

the answer will be the last one

step-by-step explanation:

5×5×5+2(8)÷2(2)+3(3)

15+16÷4+9

31÷13

do 31÷13 and u will get ur answer