Answer:
x= 1 and y= 10
Explanation:
y= 4x+6 (1)
x= 21-2y (2)
sub (1) into (2):
x= 21-2(4x+6)
x= 21-8x-12
9x= 9
x= 1 (3)
sub (3) into (1):
y= 4(1)+6
= 10
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