11x + 15y = -23 and 7x - 2y = 20 by subsitution method
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x = 2 & y = -3
Step-by-step explanation:
11x + 15y = -23 .......(1)
and 7x - 2y = 20
7x - 2y = 20
x = (20+2y)/7 ......(2)
From (1):
11x + 15y = -23
11(20+2y)/7 + 15y = -23 [From (2)]
220 +22y + 105y = -161
127y = -381
y = -3
x = (20+2y)/7 = {20+2*(-3)}/7
= (20-6)/7
= 2
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