(3) Solve the simultaneous equations by Cramer's rule : 7x + 3y = 15; 12y - 5x = 39
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Answered by
2
Answer:
7x+3y=15;12y−5x=39
D=
∣
∣
∣
∣
∣
∣
7
−5
3
12
∣
∣
∣
∣
∣
∣
=7×12−(−5)×3=84+15=99
D
x
=
∣
∣
∣
∣
∣
∣
15
39
3
12
∣
∣
∣
∣
∣
∣
=15×12−39×3=180−117=63
D
y
=
∣
∣
∣
∣
∣
∣
7
−5
15
39
∣
∣
∣
∣
∣
∣
=7×39−(−5)×15=273+75=348
x=
D
D
x
=
99
63
=
11
7
y=
D
D
y
=
99
348
=
33
116
(x,y)=(
11
7
,
33
116
)
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Answer:
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