2x-8y – 5z = 7
8x + 9y + 5z = -6
6x- 10y - 5z = 5

Let's solve for x.

2x−8y−5z=7

Step 1: Add 8y to both sides.

2x−8y−5z+8y=7+8y

2x−5z=8y+7

Step 2: Add 5z to both sides.

2x−5z+5z=8y+7+5z

2x=8y+5z+7

Step 3: Divide both sides by 2.

2x/2=8y+5z+7/2

x=4y+5/2z+7/2

Let's solve for x.

8x+9y+5z=−6

Step 1: Add -9y to both sides.

8x+9y+5z+−9y=−6+−9y

8x+5z=−9y−6

Step 2: Add -5z to both sides.

8x+5z+−5z=−9y−6+−5z

8x=−9y−5z−6

Step 3: Divide both sides by 8.

8x/8=−9y−5z−6/8

x=−9/8y+−5/8z+−3/4

Let's solve for x.

6x−10y−5z=5

Step 1: Add 10y to both sides.

6x−10y−5z+10y=5+10y

6x−5z=10y+5

Step 2: Add 5z to both sides.

6x−5z+5z=10y+5+5z

6x=10y+5z+5

Step 3: Divide both sides by 6.

6x/6=10y+5z+5/6

x=5/3y+5/6z+5/6

Step-by-step explanation:

hopes this helps:-)

you can not drow on this

step-by-step explanation:

- "runner b is moving at a slower rate."

- "the graphs shown are graphs of distance(km) against time(min).

the slopes of this graphs are are given by:

slope = (change in y)/(change in x)

= (change in distance)/(change in time)

this is the formula for finding the speed. so, the slope of these graphs represent the speed of the runner.

taking each division in the graph to represent 1 on both axis:

runner a ⇒ speed = (2-0)/(1-0)

= 2/1

= 2 km/min

runner b ⇒ speed = (3-0)/(3-0)

= 3/3

= 1 km/min

this shows that   runner b is moving at a slower rate."