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infinite solutions

Step-by-step explanation:

x = 3y+9

9-x=-3y

Substitute x into the second equation

9 - (3y+9) = -3y

Distribute

9-3y-9= -3y

-3y = -3y

Add 3y to each side

-3y+3y = -3y +3y

0=0

This is a true statement always.  When we always have a true statement, we have infinite solutions no matter what the variable is.

We have infinite solutions

u = -(6/7)w

step-by-step explanation:

place all values with 'u' on one side of the equation.

4u + 8w = - 3u + 2w

4u + 3u = 2w - 8w

further simplify the equation by solving the addition and subtraction.

7u = - 6w

make 'u' the independent variable by placing its co-efficient on the right-hand side.

u = - (6/7)w

there are 70 more legs than eyes at the dog show (196 – 126 = 70). dogs have two more legs than eyes, and humans have the same number of legs as eyes. thus 70 is twice the number of dogs at the show, so the number of dogs is half of 70, which is 35. to get the number of humans, subtract 35 from 63: 63 – 35 = 28.

step-by-step explanation: