@interface EFLinearFunction : NSObject @property (nonatomic) double slope; @property (nonatomic) double intercept; - (double)evaluateReverse:(double)a0; - (double)evaluateX:(double)a0; - (id)initWithLineThroughPoints:(id)a0; - (id)initWithSlope:(double)a0 intercept:(double)a1; @end