y=0.5x+2

-y=-2x+4

a. substitute (0.5x+2) in for y, since it = it

-(0.5x+2)=-2x+4

b. distribute and simplify and stuff

-0.5x-2=-2x+4

1.5x=6

x=4

c. substitute 4 in for x

y=0.5(4)+2

y=4

[4,4]

2.

{3x+y=-8

{-2x-y=6

repeat a,b,c

y=-3x-8

-2x-(-3x-8)=6

-2x+3x+8=6

x=-2

-2(-2)-y=6

4-y=6

y=-2

[-2,-2]

3.

{4x=y-1

{6x-2y=-3

yet again: a,b,c

y=4x+1

6x-2(4x+1)=-3

6x-8x-2=-3

-2x=-1

x=1/2

4(1/2)=y-1

2=y-1

3=y

[1/2,3]

-2x -4= .5x+2 y= 16+2= 18

+2x +2x

________________

-2 -4 = 2.5 x +2-2

-6=2.5x+2 Answer: (3.2,18)

-8 = 2.5 x

3.2 = x

B) 3x+y=8 -2x-y=6

3x+ (2x-6)=8 y=-2x-6

3x + 2x -6+6 = 8+6

5x = 14

x = 2.8 y = 2(2.8) -6 5.6-6 = -.4

Answer: (2.8, -0.4)

C) 4x=y-1 y= 4x+1

6x-2y=3

6x- 2(4x+1)

6x-8x-2=3

-2x -2+2 = 3+2 4(-2.5) = y -1

-2x=5 -10 = y -1

x= -2.5 -10+1 = y-1+1

-9 = y

Answer : (-2.5, -9)

-y=-0.5x-2

-y=-2x+4

-2x+4=-0.5x-2

2x-4=0.5x+2

1.5x=6

x=4

y=4

(4,4)

3x+y=-8

-2x-y=6

y=-2x-6

3x+(-2x-6)=-8

3x-2x-6=-8

x=-2

y=-2

(-2, -2)

4x=y-1

6x-2y=-3

y=4x+1

6x-2(4x+1)=-3

6x-8x-2=-3

-2x=-1

2x=1

x=0.5

y=3

(0.5, 3)

{-2x-y=6

———–

x=-2

-6+y=-8

y=-2

(-2,-2)

————————

{y=0.5x+2

{-y=-2x+4

x=2y-4

-y=-4y+16

3y=16

go from there:)