ii) The pair of equation x+2y+5=0 and -3x-6y+1=0 have:
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x + 2y = -5———equation 1
-3x - 6y = -1 ————equation 2
Multiplying equation 1 by 3
3x + 6y = -15 ——— equation 3
Sub 1 and 3
direct answer :-12y =14
y= 14/12
y=7/6
Substitute y=7/6 in equation 1
x+2y =-5
x + 2 * 7/6 = -5
x+2*7 = -5 -6
x + 14 = -11
x=-11 - 14
x = -25
Answer is (x,y)
Answer is (7/6,-25)
-3x - 6y = -1 ————equation 2
Multiplying equation 1 by 3
3x + 6y = -15 ——— equation 3
Sub 1 and 3
direct answer :-12y =14
y= 14/12
y=7/6
Substitute y=7/6 in equation 1
x+2y =-5
x + 2 * 7/6 = -5
x+2*7 = -5 -6
x + 14 = -11
x=-11 - 14
x = -25
Answer is (x,y)
Answer is (7/6,-25)
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