# Solve the system of equations below by graphing them. what are the ordered pairs (u, b)?

u = -b + 21

u = -2b + 30

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- 10 years agoBest Answer
u = -b + 21

u = -2b + 30

Check it out - both equations are solved for "u" already. Thus,

-b + 21 = -2b + 30

-b + 2b = 30 - 21

b = 9.

u = -b + 21 = -(9) + 21 = 12

u = -2b + 30 = -2(9) + 30 = 12

So, the ordered pair is (12,9).

Source(s): :) - Jeff AaronLv 710 years ago
Subtract those two equations:

0 = b - 9

b = 9

Substitute that into the first equation:

u = -9 + 21

u = 12

I'd think the ordered pairs would be (b,u), but if you want (u,b), it's (12,9).

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