From the given pair of linear equations 3x+ay=50 and 9x-21y=15.Find the value of 'a' for them to be parallel
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14
Answer:
a=-7
explanation
see in the attachment provided above......
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4
Answer:
slope m = -a/b
equations
3x+ay-50=0 ......(1)
9x-21y-15=0 ......(2)
eq(1)
a=3 b=a
slope m1=-a/b
=-3/a
eq(2)
a=9 b=-21
slope m2=-a/b
=-9/-21
=3/7
from eq (1) and (2) (for parallel m1=m2)
-3/a=3/7
3a=-21
a= -7
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