we get from 1st set of x,y values=> a+b=-2
from the second set we get, 2a + (b/4) = -11
solving these two we get a= -6, b= 4
hence when x= -2, y= -2a + (b/4) = 13
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we get from 1st set of x,y values=> a+b=-2
from the second set we get, 2a + (b/4) = -11
solving these two we get a= -6, b= 4
hence when x= -2, y= -2a + (b/4) = 13