ramiromillosque
Answered

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The graphs Ax + By: 18 and Ax - By: 6 intersect in (3,-2). He finds A and B.

please I thank you much...:)

Sagot :

substitute your point (3,-2) on both equations:
A(3)+b(-2)=18 <--equation 1
a(3)-b(-2)=6 <--equation 2
add both equations, you'll get
6A=24
A=4

substitute the value of A in any equtions
equation 1: (4)(3)-2b=18
simplify and solve for b, you'll get b=-3

thus, A=4 & B=-3


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