by 
Anonymous
ANSWERS: 1
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Three simultaneous equations in three unknowns. Since they are fairly simple equations, the easiest way to solve them is: See how p is on its own in the last equation: Add 6q to both sides and you will get a formula for p in terms of q. In the second equation adding 7r to both sides will give you q in terms of r. So now you can replace the ps in the first equation with their definition in terms of q, and replace the q with its definition in terms of r. You get an equation with only r in it, which will be easy. And then since you know q in terms of r, you find q. And since you know p in terms of q, you find p.
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