Posted by Algebra PLEASE HELP!! on Sunday, March 18, 2012 at 11:29pm.
The point (-1,-3) must lie on both curves. Thus
-A -4*(-3) = 9
-A +12 = 9
A = 3
and
4*(-1) +B*(-3) = -1
Solve that for B
x = - 1
y = - 3
A x – 4 y = 9
A * ( - 1 ) - 4 * ( - 3 ) = 9
- A + 12 = 9
- A = 9 - 12
- A = -3 Multiply both sides by - 1
A = 3
4 x + B y = –1
4 * ( - 1 ) + B * ( - 3 ) = - 1
- 4 - 3 B = - 1
- 3 B = - 1 + 4
- 3 B = 3 Divide both sides by - 3
B = 3 / - 3
B = - 1
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