1.
A.
Y = 9 + 3Z ------------- (1)
Y = 51 - 3Z ------------ (2)
Adding equation 1 and 2,
2Y = 9+51 = 60
Y = 30
Z = (30-9)/3
Z = 7
So, Y = 30 ; Z = 7
----
B.
4a + 2b = 20 --------------- (3)
15a + 5b = 60 ---------------(4)
Multiplying eq. 3 by 5 and multiplying eq. 4 with 2 and subtracting eq. 3 from 4.
2*(15a + 5b) - 5*(4a + 2b) = 120 - 100
30a - 20a = 20
a = 20/10
a = 2
b = (20-8)/2 = 6
So, a = 2 ; b = 6
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