20. Solve 2x + 3y = 11 and 2x - 4y = - 24 and hence find the value of 'm' for which
y=mx + 3.
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2x+3y=11. __________(1)
2x-4y=-24. __________(2)
subtracting 1 and 2
2x+3y=11
2x-4y=-24
(-).(+). (+)
________
7y=35
y=35/7
y=5. _______(3)
putting 3 in 1
2x+3y=11
2x+3(5)=11
2x+15=11
2x= 11-15
X=-4/2
X=-2
therefore, y=MX+3
5=m(-2)+3
2m=3-5
m=-2/2. =-1 ans.
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